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Rules of Radicals
Rules of Radicals
All variables are assumed
to be non-negative
in the following discussion.
Square Rule: x2 =x x = x.
Rules of Radicals
All variables are assumed
to be non-negative
in the following discussion.
Square Rule: x2 =x x = x.
Multiplication Rule: x·y = x·y
Rules of Radicals
All variables are assumed
to be non-negative
in the following discussion.
Example A. Simplify
a. 8
Square Rule: x2 =x x = x.
Multiplication Rule: x·y = x·y
We use these rules to simplify root-expressions.
Rules of Radicals
All variables are assumed
to be non-negative
in the following discussion.
Example A. Simplify
a. 8 =
Square Rule: x2 =x x = x.
Multiplication Rule: x·y = x·y
We use these rules to simplify root-expressions.
In particular, look for square factors 4, 9, 16, 25, 36,..
of the radicand to extract when simplifying square-root.
Rules of Radicals
All variables are assumed
to be non-negative
in the following discussion.
Example A. Simplify
a. 8 =
Square Rule: x2 =x x = x.
Multiplication Rule: x·y = x·y
We use these rules to simplify root-expressions.
In particular, look for square factors 4, 9, 16, 25, 36,..
of the radicand to extract when simplifying square-root.
Rules of Radicals
All variables are assumed
to be non-negative
in the following discussion.
The square number 4
is a factor of 8.
Example A. Simplify
a. 8 = 42 = 22
Square Rule: x2 =x x = x.
Multiplication Rule: x·y = x·y
We use these rules to simplify root-expressions.
In particular, look for square factors 4, 9, 16, 25, 36,..
of the radicand to extract when simplifying square-root.
Rules of Radicals
All variables are assumed
to be non-negative
in the following discussion.
The square number 4
is a factor of 8.
Example A. Simplify
a. 8 = 42 = 22
Square Rule: x2 =x x = x.
Multiplication Rule: x·y = x·y
We use these rules to simplify root-expressions.
In particular, look for square factors 4, 9, 16, 25, 36,..
of the radicand to extract when simplifying square-root.
Rules of Radicals
b. 72 =
All variables are assumed
to be non-negative
in the following discussion.
The square number 36
is a factor of 72.
Example A. Simplify
a. 8 = 42 = 22
Square Rule: x2 =x x = x.
Multiplication Rule: x·y = x·y
We use these rules to simplify root-expressions.
In particular, look for square factors 4, 9, 16, 25, 36,..
of the radicand to extract when simplifying square-root.
Rules of Radicals
b. 72 =362
All variables are assumed
to be non-negative
in the following discussion.
The square number 36
is a factor of 72.
Example A. Simplify
a. 8 = 42 = 22
Square Rule: x2 =x x = x.
Multiplication Rule: x·y = x·y
We use these rules to simplify root-expressions.
In particular, look for square factors 4, 9, 16, 25, 36,..
of the radicand to extract when simplifying square-root.
Rules of Radicals
b. 72 =362 = 62
All variables are assumed
to be non-negative
in the following discussion.
The square number 36
is a factor of 72.
Example A. Simplify
a. 8 = 42 = 22
Square Rule: x2 =x x = x.
Multiplication Rule: x·y = x·y
We use these rules to simplify root-expressions.
In particular, look for square factors 4, 9, 16, 25, 36,..
of the radicand to extract when simplifying square-root.
Rules of Radicals
b. 72 =362 = 62
c. x2y
All variables are assumed
to be non-negative
in the following discussion.
Example A. Simplify
a. 8 = 42 = 22
Square Rule: x2 =x x = x.
Multiplication Rule: x·y = x·y
We use these rules to simplify root-expressions.
In particular, look for square factors 4, 9, 16, 25, 36,..
of the radicand to extract when simplifying square-root.
Rules of Radicals
b. 72 =362 = 62
c. x2y =x2y
All variables are assumed
to be non-negative
in the following discussion.
Example A. Simplify
a. 8 = 42 = 22
Square Rule: x2 =x x = x.
Multiplication Rule: x·y = x·y
We use these rules to simplify root-expressions.
In particular, look for square factors 4, 9, 16, 25, 36,..
of the radicand to extract when simplifying square-root.
Rules of Radicals
b. 72 =362 = 62
c. x2y =x2y = xy
All variables are assumed
to be non-negative
in the following discussion.
Example A. Simplify
a. 8 = 42 = 22
Square Rule: x2 =x x = x.
Multiplication Rule: x·y = x·y
We use these rules to simplify root-expressions.
In particular, look for square factors 4, 9, 16, 25, 36,..
of the radicand to extract when simplifying square-root.
Rules of Radicals
b. 72 =362 = 62
d. x2y3
c. x2y =x2y = xy
All variables are assumed
to be non-negative
in the following discussion.
Example A. Simplify
a. 8 = 42 = 22
Square Rule: x2 =x x = x.
Multiplication Rule: x·y = x·y
We use these rules to simplify root-expressions.
In particular, look for square factors 4, 9, 16, 25, 36,..
of the radicand to extract when simplifying square-root.
Rules of Radicals
b. 72 =362 = 62
d. x2y3 =x2y2y
c. x2y =x2y = xy
All variables are assumed
to be non-negative
in the following discussion.
Example A. Simplify
a. 8 = 42 = 22
Square Rule: x2 =x x = x.
Multiplication Rule: x·y = x·y
We use these rules to simplify root-expressions.
In particular, look for square factors 4, 9, 16, 25, 36,..
of the radicand to extract when simplifying square-root.
Rules of Radicals
b. 72 =362 = 62
d. x2y3 =x2y2y = xyy
c. x2y =x2y = xy
All variables are assumed
to be non-negative
in the following discussion.
Example A. Simplify
a. 8 = 42 = 22
Square Rule: x2 =x x = x.
Multiplication Rule: x·y = x·y
We use these rules to simplify root-expressions.
In particular, look for square factors 4, 9, 16, 25, 36,..
of the radicand to extract when simplifying square-root.
Rules of Radicals
b. 72 =362 = 62
d. x2y3 =x2y2y = xyy
c. x2y =x2y = xy
All variables are assumed
to be non-negative
in the following discussion.
A radical expression is said to be simplified
if as much as possible is extracted out of the radical.
Example A. Simplify
a. 8 = 42 = 22
Square Rule: x2 =x x = x.
Multiplication Rule: x·y = x·y
We use these rules to simplify root-expressions.
In particular, look for square factors 4, 9, 16, 25, 36,..
of the radicand to extract when simplifying square-root.
Rules of Radicals
b. 72 =362 = 62
d. x2y3 =x2y2y = xyy
c. x2y =x2y = xy
All variables are assumed
to be non-negative
in the following discussion.
(For example 72 =98 = 38 are not simplified, but 62 is.)
A radical expression is said to be simplified
if as much as possible is extracted out of the radical.
Rules of Radicals
We may simplify a radical expression by extracting roots
out of the radical in steps.
Example B. Simplify.
a. 72
Rules of Radicals
We may simplify a radical expression by extracting roots
out of the radical in steps.
Example B. Simplify.
a. 72 = 4 18
Rules of Radicals
We may simplify a radical expression by extracting roots
out of the radical in steps.
Example B. Simplify.
a. 72 = 4 18 = 218 (not simplified yet)
Rules of Radicals
We may simplify a radical expression by extracting roots
out of the radical in steps.
Example B. Simplify.
a. 72 = 4 18 = 218 (not simplified yet)
= 292
Rules of Radicals
We may simplify a radical expression by extracting roots
out of the radical in steps.
We may simplify a radical expression by extracting roots
out of the radical in steps.
Example B. Simplify.
a. 72 = 4 18 = 218 (not simplified yet)
= 292 = 2*3*2
Rules of Radicals
Example B. Simplify.
a. 72 = 4 18 = 218 (not simplified yet)
= 292 = 2*3*2 = 62 (simplified)
Rules of Radicals
We may simplify a radical expression by extracting roots
out of the radical in steps.
Example B. Simplify.
a. 72 = 4 18 = 218 (not simplified yet)
= 292 = 2*3*2 = 62 (simplified)
b.80x4y5
Rules of Radicals
We may simplify a radical expression by extracting roots
out of the radical in steps.
Example B. Simplify.
a. 72 = 4 18 = 218 (not simplified yet)
= 292 = 2*3*2 = 62 (simplified)
b.80x4y5 = 16·5x4y4y
Rules of Radicals
We may simplify a radical expression by extracting roots
out of the radical in steps.
Example B. Simplify.
a. 72 = 4 18 = 218 (not simplified yet)
= 292 = 2*3*2 = 62 (simplified)
b.80x4y5 = 16·5x4y4y
= 4x2y25y
Rules of Radicals
We may simplify a radical expression by extracting roots
out of the radical in steps.
Example B. Simplify.
a. 72 = 4 18 = 218 (not simplified yet)
= 292 = 2*3*2 = 62 (simplified)
b.80x4y5 = 16·5x4y4y
= 4x2y25y
Rules of Radicals
Division Rule: y
x
y
x
 =
We may simplify a radical expression by extracting roots
out of the radical in steps.
Example B. Simplify.
a. 72 = 4 18 = 218 (not simplified yet)
= 292 = 2*3*2 = 62 (simplified)
b.80x4y5 = 16·5x4y4y
= 4x2y25y
Rules of Radicals
Division Rule: y
x
y
x
 =
Example C. Simplify.
We may simplify a radical expression by extracting roots
out of the radical in steps.
Example B. Simplify.
a. 72 = 4 18 = 218 (not simplified yet)
= 292 = 2*3*2 = 62 (simplified)
b.80x4y5 = 16·5x4y4y
= 4x2y25y
Rules of Radicals
Division Rule: y
x
y
x
 =
Example C. Simplify.
9
4
a.
We may simplify a radical expression by extracting roots
out of the radical in steps.
Example B. Simplify.
a. 72 = 4 18 = 218 (not simplified yet)
= 292 = 2*3*2 = 62 (simplified)
b.80x4y5 = 16·5x4y4y
= 4x2y25y
Rules of Radicals
Division Rule: y
x
y
x
 =
Example C. Simplify.
9
4
9
4
a. =
We may simplify a radical expression by extracting roots
out of the radical in steps.
Example B. Simplify.
a. 72 = 4 18 = 218 (not simplified yet)
= 292 = 2*3*2 = 62 (simplified)
b.80x4y5 = 16·5x4y4y
= 4x2y25y
Rules of Radicals
Division Rule: y
x
y
x
 =
Example C. Simplify.
9
4
9
4
3
2
a. = =
We may simplify a radical expression by extracting roots
out of the radical in steps.
Example B. Simplify.
a. 72 = 4 18 = 218 (not simplified yet)
= 292 = 2*3*2 = 62 (simplified)
b.80x4y5 = 16·5x4y4y
= 4x2y25y
Rules of Radicals
Division Rule: y
x
y
x
 =
Example C. Simplify.
9
4
9
4
3
2
9y2
x2
a. = =
b.
We may simplify a radical expression by extracting roots
out of the radical in steps.
Example B. Simplify.
a. 72 = 4 18 = 218 (not simplified yet)
= 292 = 2*3*2 = 62 (simplified)
b.80x4y5 = 16·5x4y4y
= 4x2y25y
Rules of Radicals
Division Rule: y
x
y
x
 =
Example C. Simplify.
9
4
9
4
3
2
9y2
x2
9y2
x2
a. = =
b. =
We may simplify a radical expression by extracting roots
out of the radical in steps.
Example B. Simplify.
a. 72 = 4 18 = 218 (not simplified yet)
= 292 = 2*3*2 = 62 (simplified)
b.80x4y5 = 16·5x4y4y
= 4x2y25y
Rules of Radicals
Division Rule: y
x
y
x
 =
Example C. Simplify.
9
4
9
4
3
2
9y2
x2
9y2
x2
3y
x
a. = =
b. = =
We may simplify a radical expression by extracting roots
out of the radical in steps.
The root of a fraction is said to be simplified
if the denominator does not have any root-terms.
Rules of Radicals
Example D. Simplify
5
3a. 
The root of a fraction is said to be simplified
if the denominator does not have any root-terms.
If not, the denominator needs to be changed to be root free.
Rules of Radicals
Example D. Simplify
5
3a. 
The root of a fraction is said to be simplified
if the denominator does not have any root-terms.
If not, the denominator needs to be changed to be root free.
If the denominator does contain radical terms,
multiply the top and bottom by suitably chosen quantities
to remove the radical term in the denominator.
Rules of Radicals
Example D. Simplify
5
3a. 
Example D. Simplify
5
3
5·5
3·5
The root of a fraction is said to be simplified
if the denominator does not have any root-terms.
If not, the denominator needs to be changed to be root free.
If the denominator does contain radical terms,
multiply the top and bottom by suitably chosen quantities
to remove the radical term in the denominator.
Rules of Radicals
a. = 
Multiple an extra 5
to extract root to make
denominator to be root-free.
Example D. Simplify
5
3
5·5
3·5
The root of a fraction is said to be simplified
if the denominator does not have any root-terms.
If not, the denominator needs to be changed to be root free.
If the denominator does contain radical terms,
multiply the top and bottom by suitably chosen quantities
to remove the radical term in the denominator.
Rules of Radicals
a. =  =
25
15

Multiple an extra 5
to extract root to make
denominator to be root-free.
Example D. Simplify
5
3
5·5
3·5
The root of a fraction is said to be simplified
if the denominator does not have any root-terms.
If not, the denominator needs to be changed to be root free.
If the denominator does contain radical terms,
multiply the top and bottom by suitably chosen quantities
to remove the radical term in the denominator.
Rules of Radicals
a. =  =
25
15

=
5
15
Multiple an extra 5
to extract root to make
denominator to be root-free.
Simplified! Became the
denominator is root-free
(and the numerator is simplified).
Example D. Simplify
5
3
5·5
3·5
The root of a fraction is said to be simplified
if the denominator does not have any root-terms.
If not, the denominator needs to be changed to be root free.
If the denominator does contain radical terms,
multiply the top and bottom by suitably chosen quantities
to remove the radical term in the denominator.
Rules of Radicals
a. =  =
25
15

=
5
15
Multiple an extra 5
to extract root to make
denominator to be root-free.
Simplified! Became the
denominator is root-free
(and the numerator is simplified).
5
1 15or
Example D. Simplify
5
3
5·5
3·5
The root of a fraction is said to be simplified
if the denominator does not have any root-terms.
If not, the denominator needs to be changed to be root free.
If the denominator does contain radical terms,
multiply the top and bottom by suitably chosen quantities
to remove the radical term in the denominator.
Rules of Radicals
a. =  =
25
15

=
5
15
8x
5b. 
5
1 15or
Example D. Simplify
5
3
5·5
3·5
The root of a fraction is said to be simplified
if the denominator does not have any root-terms.
If not, the denominator needs to be changed to be root free.
If the denominator does contain radical terms,
multiply the top and bottom by suitably chosen quantities
to remove the radical term in the denominator.
Rules of Radicals
a. =  =
25
15

=
5
15
8x
5
4·2x
5b. = 
5
1 15or
Example D. Simplify
5
3
5·5
3·5
The root of a fraction is said to be simplified
if the denominator does not have any root-terms.
If not, the denominator needs to be changed to be root free.
If the denominator does contain radical terms,
multiply the top and bottom by suitably chosen quantities
to remove the radical term in the denominator.
Rules of Radicals
2
a. =  =
25
15

=
5
15
8x
5
4·2x
5b. =  =
2x
5

5
1 15or
Example D. Simplify
5
3
5·5
3·5
The root of a fraction is said to be simplified
if the denominator does not have any root-terms.
If not, the denominator needs to be changed to be root free.
If the denominator does contain radical terms,
multiply the top and bottom by suitably chosen quantities
to remove the radical term in the denominator.
Rules of Radicals
2
a. =  =
25
15

=
5
15
8x
5
4·2x
5b. =  =
2x
5

=
2 2x
5
 2x
2x

5
1 15or
Example D. Simplify
5
3
5·5
3·5
The root of a fraction is said to be simplified
if the denominator does not have any root-terms.
If not, the denominator needs to be changed to be root free.
If the denominator does contain radical terms,
multiply the top and bottom by suitably chosen quantities
to remove the radical term in the denominator.
Rules of Radicals
2
a. =  =
25
15

=
5
15
8x
5
4·2x
5b. =  =
2x
5

=
2 2x
5
 2x
2x

=
2 2x
10x
*
5
1 15or
Example D. Simplify
5
3
5·5
3·5
The root of a fraction is said to be simplified
if the denominator does not have any root-terms.
If not, the denominator needs to be changed to be root free.
If the denominator does contain radical terms,
multiply the top and bottom by suitably chosen quantities
to remove the radical term in the denominator.
Rules of Radicals
2
a. =  =
25
15

=
5
15
8x
5
4·2x
5b. =  =
2x
5

=
2 2x
5
 2x
2x

=
2 2x
10x
*
=
4x
10x
5
1 15or
Example D. Simplify
5
3
5·5
3·5
The root of a fraction is said to be simplified
if the denominator does not have any root-terms.
If not, the denominator needs to be changed to be root free.
If the denominator does contain radical terms,
multiply the top and bottom by suitably chosen quantities
to remove the radical term in the denominator.
Rules of Radicals
2
a. =  =
25
15

=
5
15
8x
5
4·2x
5b. =  =
2x
5

=
2 2x
5
 2x
2x

=
2 2x
10x
*
=
4x
10x
5
1 15or
4x
1 10xor
Example D. Simplify
5
3
5·5
3·5
The root of a fraction is said to be simplified
if the denominator does not have any root-terms.
If not, the denominator needs to be changed to be root free.
If the denominator does contain radical terms,
multiply the top and bottom by suitably chosen quantities
to remove the radical term in the denominator.
Rules of Radicals
2
a. =  =
25
15

=
5
15
8x
5
4·2x
5b. =  =
2x
5

=
2 2x
5
 2x
2x

=
2 2x
10x
*
=
4x
10x
WARNING!!!!
a ± b = a ±b
5
1 15or
4x
1 10xor
Example D. Simplify
5
3
5·5
3·5
The root of a fraction is said to be simplified
if the denominator does not have any root-terms.
If not, the denominator needs to be changed to be root free.
If the denominator does contain radical terms,
multiply the top and bottom by suitably chosen quantities
to remove the radical term in the denominator.
Rules of Radicals
2
a. =  =
25
15

=
5
15
8x
5
4·2x
5b. =  =
2x
5

=
2 2x
5
 2x
2x

=
2 2x
10x
*
=
4x
10x
WARNING!!!!
a ± b = a ±b
For example: 4 + 913 =
5
1 15or
4x
1 10xor
Example D. Simplify
5
3
5·5
3·5
The root of a fraction is said to be simplified
if the denominator does not have any root-terms.
If not, the denominator needs to be changed to be root free.
If the denominator does contain radical terms,
multiply the top and bottom by suitably chosen quantities
to remove the radical term in the denominator.
Rules of Radicals
2
a. =  =
25
15

=
5
15
8x
5
4·2x
5b. =  =
2x
5

=
2 2x
5
 2x
2x

=
2 2x
10x
*
=
4x
10x
WARNING!!!!
a ± b = a ±b
For example: 4 + 913 =
5
1 15or
4x
1 10xor
Example D. Simplify
5
3
5·5
3·5
The root of a fraction is said to be simplified
if the denominator does not have any root-terms.
If not, the denominator needs to be changed to be root free.
If the denominator does contain radical terms,
multiply the top and bottom by suitably chosen quantities
to remove the radical term in the denominator.
Rules of Radicals
2
a. =  =
25
15

=
5
15
8x
5
4·2x
5b. =  =
2x
5

=
2 2x
5
 2x
2x

=
2 2x
10x
*
=
4x
10x
WARNING!!!!
a ± b = a ±b
For example: 4 + 9 = 4 +913 =
5
1 15or
4x
1 10xor
Example D. Simplify
5
3
5·5
3·5
The root of a fraction is said to be simplified
if the denominator does not have any root-terms.
If not, the denominator needs to be changed to be root free.
If the denominator does contain radical terms,
multiply the top and bottom by suitably chosen quantities
to remove the radical term in the denominator.
Rules of Radicals
2
a. =  =
25
15

=
5
15
8x
5
4·2x
5b. =  =
2x
5

=
2 2x
5
 2x
2x

=
2 2x
10x
*
=
4x
10x
WARNING!!!!
a ± b = a ±b
For example: 4 + 9 = 4 +9 = 2 + 3 = 513 =
5
1 15or
4x
1 10xor
Rules of Radicals
Exercise A. Simplify the following radicals.
1. 12 2. 18 3. 20 4. 28
5. 32 6. 36 7. 40 8. 45
9. 54 10. 60 11. 72 12. 84
13. 90 14. 96x2 15. 108x3 16. 120x2y2
17. 150y4 18. 189x3y2 19. 240x5y8 18. 242x19y34
19. 12 12 20. 1818 21. 2 16
23. 183
22. 123
24. 1227 25. 1850 26. 1040
27. 20x15x 28.12xy15y
29. 32xy324x5 30. x8y13x15y9
Exercise B. Simplify the following radicals. Remember that
you have a choice to simplify each of the radicals first then
multiply, or multiply the radicals first then simplify.
Rules of Radicals
Exercise C. Simplify the following radicals. Remember that
you have a choice to simplify each of the radicals first then
multiply, or multiply the radicals first then simplify. Make sure
the denominators are radical–free.
8x
531. x
10
 14
5x32. 7
20
 5
1233. 15
8x
534. 3
2
 3
32x35. 7
5
 5
236. 29
x

x
(x + 1)39. x
(x + 1)
 x
(x + 1)40. x(x + 1)
1

1
(x + 1)
37.
x
(x2 – 1)41. x(x + 1)
(x – 1)

x
(x + 1)38.
x21 – 1
Exercise D. Take the denominators of out of the radical.
42.
9x21 – 143.

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4 2 rules of radicals-x

  • 2. Rules of Radicals All variables are assumed to be non-negative in the following discussion.
  • 3. Square Rule: x2 =x x = x. Rules of Radicals All variables are assumed to be non-negative in the following discussion.
  • 4. Square Rule: x2 =x x = x. Multiplication Rule: x·y = x·y Rules of Radicals All variables are assumed to be non-negative in the following discussion.
  • 5. Example A. Simplify a. 8 Square Rule: x2 =x x = x. Multiplication Rule: x·y = x·y We use these rules to simplify root-expressions. Rules of Radicals All variables are assumed to be non-negative in the following discussion.
  • 6. Example A. Simplify a. 8 = Square Rule: x2 =x x = x. Multiplication Rule: x·y = x·y We use these rules to simplify root-expressions. In particular, look for square factors 4, 9, 16, 25, 36,.. of the radicand to extract when simplifying square-root. Rules of Radicals All variables are assumed to be non-negative in the following discussion.
  • 7. Example A. Simplify a. 8 = Square Rule: x2 =x x = x. Multiplication Rule: x·y = x·y We use these rules to simplify root-expressions. In particular, look for square factors 4, 9, 16, 25, 36,.. of the radicand to extract when simplifying square-root. Rules of Radicals All variables are assumed to be non-negative in the following discussion. The square number 4 is a factor of 8.
  • 8. Example A. Simplify a. 8 = 42 = 22 Square Rule: x2 =x x = x. Multiplication Rule: x·y = x·y We use these rules to simplify root-expressions. In particular, look for square factors 4, 9, 16, 25, 36,.. of the radicand to extract when simplifying square-root. Rules of Radicals All variables are assumed to be non-negative in the following discussion. The square number 4 is a factor of 8.
  • 9. Example A. Simplify a. 8 = 42 = 22 Square Rule: x2 =x x = x. Multiplication Rule: x·y = x·y We use these rules to simplify root-expressions. In particular, look for square factors 4, 9, 16, 25, 36,.. of the radicand to extract when simplifying square-root. Rules of Radicals b. 72 = All variables are assumed to be non-negative in the following discussion. The square number 36 is a factor of 72.
  • 10. Example A. Simplify a. 8 = 42 = 22 Square Rule: x2 =x x = x. Multiplication Rule: x·y = x·y We use these rules to simplify root-expressions. In particular, look for square factors 4, 9, 16, 25, 36,.. of the radicand to extract when simplifying square-root. Rules of Radicals b. 72 =362 All variables are assumed to be non-negative in the following discussion. The square number 36 is a factor of 72.
  • 11. Example A. Simplify a. 8 = 42 = 22 Square Rule: x2 =x x = x. Multiplication Rule: x·y = x·y We use these rules to simplify root-expressions. In particular, look for square factors 4, 9, 16, 25, 36,.. of the radicand to extract when simplifying square-root. Rules of Radicals b. 72 =362 = 62 All variables are assumed to be non-negative in the following discussion. The square number 36 is a factor of 72.
  • 12. Example A. Simplify a. 8 = 42 = 22 Square Rule: x2 =x x = x. Multiplication Rule: x·y = x·y We use these rules to simplify root-expressions. In particular, look for square factors 4, 9, 16, 25, 36,.. of the radicand to extract when simplifying square-root. Rules of Radicals b. 72 =362 = 62 c. x2y All variables are assumed to be non-negative in the following discussion.
  • 13. Example A. Simplify a. 8 = 42 = 22 Square Rule: x2 =x x = x. Multiplication Rule: x·y = x·y We use these rules to simplify root-expressions. In particular, look for square factors 4, 9, 16, 25, 36,.. of the radicand to extract when simplifying square-root. Rules of Radicals b. 72 =362 = 62 c. x2y =x2y All variables are assumed to be non-negative in the following discussion.
  • 14. Example A. Simplify a. 8 = 42 = 22 Square Rule: x2 =x x = x. Multiplication Rule: x·y = x·y We use these rules to simplify root-expressions. In particular, look for square factors 4, 9, 16, 25, 36,.. of the radicand to extract when simplifying square-root. Rules of Radicals b. 72 =362 = 62 c. x2y =x2y = xy All variables are assumed to be non-negative in the following discussion.
  • 15. Example A. Simplify a. 8 = 42 = 22 Square Rule: x2 =x x = x. Multiplication Rule: x·y = x·y We use these rules to simplify root-expressions. In particular, look for square factors 4, 9, 16, 25, 36,.. of the radicand to extract when simplifying square-root. Rules of Radicals b. 72 =362 = 62 d. x2y3 c. x2y =x2y = xy All variables are assumed to be non-negative in the following discussion.
  • 16. Example A. Simplify a. 8 = 42 = 22 Square Rule: x2 =x x = x. Multiplication Rule: x·y = x·y We use these rules to simplify root-expressions. In particular, look for square factors 4, 9, 16, 25, 36,.. of the radicand to extract when simplifying square-root. Rules of Radicals b. 72 =362 = 62 d. x2y3 =x2y2y c. x2y =x2y = xy All variables are assumed to be non-negative in the following discussion.
  • 17. Example A. Simplify a. 8 = 42 = 22 Square Rule: x2 =x x = x. Multiplication Rule: x·y = x·y We use these rules to simplify root-expressions. In particular, look for square factors 4, 9, 16, 25, 36,.. of the radicand to extract when simplifying square-root. Rules of Radicals b. 72 =362 = 62 d. x2y3 =x2y2y = xyy c. x2y =x2y = xy All variables are assumed to be non-negative in the following discussion.
  • 18. Example A. Simplify a. 8 = 42 = 22 Square Rule: x2 =x x = x. Multiplication Rule: x·y = x·y We use these rules to simplify root-expressions. In particular, look for square factors 4, 9, 16, 25, 36,.. of the radicand to extract when simplifying square-root. Rules of Radicals b. 72 =362 = 62 d. x2y3 =x2y2y = xyy c. x2y =x2y = xy All variables are assumed to be non-negative in the following discussion. A radical expression is said to be simplified if as much as possible is extracted out of the radical.
  • 19. Example A. Simplify a. 8 = 42 = 22 Square Rule: x2 =x x = x. Multiplication Rule: x·y = x·y We use these rules to simplify root-expressions. In particular, look for square factors 4, 9, 16, 25, 36,.. of the radicand to extract when simplifying square-root. Rules of Radicals b. 72 =362 = 62 d. x2y3 =x2y2y = xyy c. x2y =x2y = xy All variables are assumed to be non-negative in the following discussion. (For example 72 =98 = 38 are not simplified, but 62 is.) A radical expression is said to be simplified if as much as possible is extracted out of the radical.
  • 20. Rules of Radicals We may simplify a radical expression by extracting roots out of the radical in steps.
  • 21. Example B. Simplify. a. 72 Rules of Radicals We may simplify a radical expression by extracting roots out of the radical in steps.
  • 22. Example B. Simplify. a. 72 = 4 18 Rules of Radicals We may simplify a radical expression by extracting roots out of the radical in steps.
  • 23. Example B. Simplify. a. 72 = 4 18 = 218 (not simplified yet) Rules of Radicals We may simplify a radical expression by extracting roots out of the radical in steps.
  • 24. Example B. Simplify. a. 72 = 4 18 = 218 (not simplified yet) = 292 Rules of Radicals We may simplify a radical expression by extracting roots out of the radical in steps.
  • 25. We may simplify a radical expression by extracting roots out of the radical in steps. Example B. Simplify. a. 72 = 4 18 = 218 (not simplified yet) = 292 = 2*3*2 Rules of Radicals
  • 26. Example B. Simplify. a. 72 = 4 18 = 218 (not simplified yet) = 292 = 2*3*2 = 62 (simplified) Rules of Radicals We may simplify a radical expression by extracting roots out of the radical in steps.
  • 27. Example B. Simplify. a. 72 = 4 18 = 218 (not simplified yet) = 292 = 2*3*2 = 62 (simplified) b.80x4y5 Rules of Radicals We may simplify a radical expression by extracting roots out of the radical in steps.
  • 28. Example B. Simplify. a. 72 = 4 18 = 218 (not simplified yet) = 292 = 2*3*2 = 62 (simplified) b.80x4y5 = 16·5x4y4y Rules of Radicals We may simplify a radical expression by extracting roots out of the radical in steps.
  • 29. Example B. Simplify. a. 72 = 4 18 = 218 (not simplified yet) = 292 = 2*3*2 = 62 (simplified) b.80x4y5 = 16·5x4y4y = 4x2y25y Rules of Radicals We may simplify a radical expression by extracting roots out of the radical in steps.
  • 30. Example B. Simplify. a. 72 = 4 18 = 218 (not simplified yet) = 292 = 2*3*2 = 62 (simplified) b.80x4y5 = 16·5x4y4y = 4x2y25y Rules of Radicals Division Rule: y x y x  = We may simplify a radical expression by extracting roots out of the radical in steps.
  • 31. Example B. Simplify. a. 72 = 4 18 = 218 (not simplified yet) = 292 = 2*3*2 = 62 (simplified) b.80x4y5 = 16·5x4y4y = 4x2y25y Rules of Radicals Division Rule: y x y x  = Example C. Simplify. We may simplify a radical expression by extracting roots out of the radical in steps.
  • 32. Example B. Simplify. a. 72 = 4 18 = 218 (not simplified yet) = 292 = 2*3*2 = 62 (simplified) b.80x4y5 = 16·5x4y4y = 4x2y25y Rules of Radicals Division Rule: y x y x  = Example C. Simplify. 9 4 a. We may simplify a radical expression by extracting roots out of the radical in steps.
  • 33. Example B. Simplify. a. 72 = 4 18 = 218 (not simplified yet) = 292 = 2*3*2 = 62 (simplified) b.80x4y5 = 16·5x4y4y = 4x2y25y Rules of Radicals Division Rule: y x y x  = Example C. Simplify. 9 4 9 4 a. = We may simplify a radical expression by extracting roots out of the radical in steps.
  • 34. Example B. Simplify. a. 72 = 4 18 = 218 (not simplified yet) = 292 = 2*3*2 = 62 (simplified) b.80x4y5 = 16·5x4y4y = 4x2y25y Rules of Radicals Division Rule: y x y x  = Example C. Simplify. 9 4 9 4 3 2 a. = = We may simplify a radical expression by extracting roots out of the radical in steps.
  • 35. Example B. Simplify. a. 72 = 4 18 = 218 (not simplified yet) = 292 = 2*3*2 = 62 (simplified) b.80x4y5 = 16·5x4y4y = 4x2y25y Rules of Radicals Division Rule: y x y x  = Example C. Simplify. 9 4 9 4 3 2 9y2 x2 a. = = b. We may simplify a radical expression by extracting roots out of the radical in steps.
  • 36. Example B. Simplify. a. 72 = 4 18 = 218 (not simplified yet) = 292 = 2*3*2 = 62 (simplified) b.80x4y5 = 16·5x4y4y = 4x2y25y Rules of Radicals Division Rule: y x y x  = Example C. Simplify. 9 4 9 4 3 2 9y2 x2 9y2 x2 a. = = b. = We may simplify a radical expression by extracting roots out of the radical in steps.
  • 37. Example B. Simplify. a. 72 = 4 18 = 218 (not simplified yet) = 292 = 2*3*2 = 62 (simplified) b.80x4y5 = 16·5x4y4y = 4x2y25y Rules of Radicals Division Rule: y x y x  = Example C. Simplify. 9 4 9 4 3 2 9y2 x2 9y2 x2 3y x a. = = b. = = We may simplify a radical expression by extracting roots out of the radical in steps.
  • 38. The root of a fraction is said to be simplified if the denominator does not have any root-terms. Rules of Radicals Example D. Simplify 5 3a. 
  • 39. The root of a fraction is said to be simplified if the denominator does not have any root-terms. If not, the denominator needs to be changed to be root free. Rules of Radicals Example D. Simplify 5 3a. 
  • 40. The root of a fraction is said to be simplified if the denominator does not have any root-terms. If not, the denominator needs to be changed to be root free. If the denominator does contain radical terms, multiply the top and bottom by suitably chosen quantities to remove the radical term in the denominator. Rules of Radicals Example D. Simplify 5 3a. 
  • 41. Example D. Simplify 5 3 5·5 3·5 The root of a fraction is said to be simplified if the denominator does not have any root-terms. If not, the denominator needs to be changed to be root free. If the denominator does contain radical terms, multiply the top and bottom by suitably chosen quantities to remove the radical term in the denominator. Rules of Radicals a. =  Multiple an extra 5 to extract root to make denominator to be root-free.
  • 42. Example D. Simplify 5 3 5·5 3·5 The root of a fraction is said to be simplified if the denominator does not have any root-terms. If not, the denominator needs to be changed to be root free. If the denominator does contain radical terms, multiply the top and bottom by suitably chosen quantities to remove the radical term in the denominator. Rules of Radicals a. =  = 25 15  Multiple an extra 5 to extract root to make denominator to be root-free.
  • 43. Example D. Simplify 5 3 5·5 3·5 The root of a fraction is said to be simplified if the denominator does not have any root-terms. If not, the denominator needs to be changed to be root free. If the denominator does contain radical terms, multiply the top and bottom by suitably chosen quantities to remove the radical term in the denominator. Rules of Radicals a. =  = 25 15  = 5 15 Multiple an extra 5 to extract root to make denominator to be root-free. Simplified! Became the denominator is root-free (and the numerator is simplified).
  • 44. Example D. Simplify 5 3 5·5 3·5 The root of a fraction is said to be simplified if the denominator does not have any root-terms. If not, the denominator needs to be changed to be root free. If the denominator does contain radical terms, multiply the top and bottom by suitably chosen quantities to remove the radical term in the denominator. Rules of Radicals a. =  = 25 15  = 5 15 Multiple an extra 5 to extract root to make denominator to be root-free. Simplified! Became the denominator is root-free (and the numerator is simplified). 5 1 15or
  • 45. Example D. Simplify 5 3 5·5 3·5 The root of a fraction is said to be simplified if the denominator does not have any root-terms. If not, the denominator needs to be changed to be root free. If the denominator does contain radical terms, multiply the top and bottom by suitably chosen quantities to remove the radical term in the denominator. Rules of Radicals a. =  = 25 15  = 5 15 8x 5b.  5 1 15or
  • 46. Example D. Simplify 5 3 5·5 3·5 The root of a fraction is said to be simplified if the denominator does not have any root-terms. If not, the denominator needs to be changed to be root free. If the denominator does contain radical terms, multiply the top and bottom by suitably chosen quantities to remove the radical term in the denominator. Rules of Radicals a. =  = 25 15  = 5 15 8x 5 4·2x 5b. =  5 1 15or
  • 47. Example D. Simplify 5 3 5·5 3·5 The root of a fraction is said to be simplified if the denominator does not have any root-terms. If not, the denominator needs to be changed to be root free. If the denominator does contain radical terms, multiply the top and bottom by suitably chosen quantities to remove the radical term in the denominator. Rules of Radicals 2 a. =  = 25 15  = 5 15 8x 5 4·2x 5b. =  = 2x 5  5 1 15or
  • 48. Example D. Simplify 5 3 5·5 3·5 The root of a fraction is said to be simplified if the denominator does not have any root-terms. If not, the denominator needs to be changed to be root free. If the denominator does contain radical terms, multiply the top and bottom by suitably chosen quantities to remove the radical term in the denominator. Rules of Radicals 2 a. =  = 25 15  = 5 15 8x 5 4·2x 5b. =  = 2x 5  = 2 2x 5  2x 2x  5 1 15or
  • 49. Example D. Simplify 5 3 5·5 3·5 The root of a fraction is said to be simplified if the denominator does not have any root-terms. If not, the denominator needs to be changed to be root free. If the denominator does contain radical terms, multiply the top and bottom by suitably chosen quantities to remove the radical term in the denominator. Rules of Radicals 2 a. =  = 25 15  = 5 15 8x 5 4·2x 5b. =  = 2x 5  = 2 2x 5  2x 2x  = 2 2x 10x * 5 1 15or
  • 50. Example D. Simplify 5 3 5·5 3·5 The root of a fraction is said to be simplified if the denominator does not have any root-terms. If not, the denominator needs to be changed to be root free. If the denominator does contain radical terms, multiply the top and bottom by suitably chosen quantities to remove the radical term in the denominator. Rules of Radicals 2 a. =  = 25 15  = 5 15 8x 5 4·2x 5b. =  = 2x 5  = 2 2x 5  2x 2x  = 2 2x 10x * = 4x 10x 5 1 15or
  • 51. Example D. Simplify 5 3 5·5 3·5 The root of a fraction is said to be simplified if the denominator does not have any root-terms. If not, the denominator needs to be changed to be root free. If the denominator does contain radical terms, multiply the top and bottom by suitably chosen quantities to remove the radical term in the denominator. Rules of Radicals 2 a. =  = 25 15  = 5 15 8x 5 4·2x 5b. =  = 2x 5  = 2 2x 5  2x 2x  = 2 2x 10x * = 4x 10x 5 1 15or 4x 1 10xor
  • 52. Example D. Simplify 5 3 5·5 3·5 The root of a fraction is said to be simplified if the denominator does not have any root-terms. If not, the denominator needs to be changed to be root free. If the denominator does contain radical terms, multiply the top and bottom by suitably chosen quantities to remove the radical term in the denominator. Rules of Radicals 2 a. =  = 25 15  = 5 15 8x 5 4·2x 5b. =  = 2x 5  = 2 2x 5  2x 2x  = 2 2x 10x * = 4x 10x WARNING!!!! a ± b = a ±b 5 1 15or 4x 1 10xor
  • 53. Example D. Simplify 5 3 5·5 3·5 The root of a fraction is said to be simplified if the denominator does not have any root-terms. If not, the denominator needs to be changed to be root free. If the denominator does contain radical terms, multiply the top and bottom by suitably chosen quantities to remove the radical term in the denominator. Rules of Radicals 2 a. =  = 25 15  = 5 15 8x 5 4·2x 5b. =  = 2x 5  = 2 2x 5  2x 2x  = 2 2x 10x * = 4x 10x WARNING!!!! a ± b = a ±b For example: 4 + 913 = 5 1 15or 4x 1 10xor
  • 54. Example D. Simplify 5 3 5·5 3·5 The root of a fraction is said to be simplified if the denominator does not have any root-terms. If not, the denominator needs to be changed to be root free. If the denominator does contain radical terms, multiply the top and bottom by suitably chosen quantities to remove the radical term in the denominator. Rules of Radicals 2 a. =  = 25 15  = 5 15 8x 5 4·2x 5b. =  = 2x 5  = 2 2x 5  2x 2x  = 2 2x 10x * = 4x 10x WARNING!!!! a ± b = a ±b For example: 4 + 913 = 5 1 15or 4x 1 10xor
  • 55. Example D. Simplify 5 3 5·5 3·5 The root of a fraction is said to be simplified if the denominator does not have any root-terms. If not, the denominator needs to be changed to be root free. If the denominator does contain radical terms, multiply the top and bottom by suitably chosen quantities to remove the radical term in the denominator. Rules of Radicals 2 a. =  = 25 15  = 5 15 8x 5 4·2x 5b. =  = 2x 5  = 2 2x 5  2x 2x  = 2 2x 10x * = 4x 10x WARNING!!!! a ± b = a ±b For example: 4 + 9 = 4 +913 = 5 1 15or 4x 1 10xor
  • 56. Example D. Simplify 5 3 5·5 3·5 The root of a fraction is said to be simplified if the denominator does not have any root-terms. If not, the denominator needs to be changed to be root free. If the denominator does contain radical terms, multiply the top and bottom by suitably chosen quantities to remove the radical term in the denominator. Rules of Radicals 2 a. =  = 25 15  = 5 15 8x 5 4·2x 5b. =  = 2x 5  = 2 2x 5  2x 2x  = 2 2x 10x * = 4x 10x WARNING!!!! a ± b = a ±b For example: 4 + 9 = 4 +9 = 2 + 3 = 513 = 5 1 15or 4x 1 10xor
  • 57. Rules of Radicals Exercise A. Simplify the following radicals. 1. 12 2. 18 3. 20 4. 28 5. 32 6. 36 7. 40 8. 45 9. 54 10. 60 11. 72 12. 84 13. 90 14. 96x2 15. 108x3 16. 120x2y2 17. 150y4 18. 189x3y2 19. 240x5y8 18. 242x19y34 19. 12 12 20. 1818 21. 2 16 23. 183 22. 123 24. 1227 25. 1850 26. 1040 27. 20x15x 28.12xy15y 29. 32xy324x5 30. x8y13x15y9 Exercise B. Simplify the following radicals. Remember that you have a choice to simplify each of the radicals first then multiply, or multiply the radicals first then simplify.
  • 58. Rules of Radicals Exercise C. Simplify the following radicals. Remember that you have a choice to simplify each of the radicals first then multiply, or multiply the radicals first then simplify. Make sure the denominators are radical–free. 8x 531. x 10  14 5x32. 7 20  5 1233. 15 8x 534. 3 2  3 32x35. 7 5  5 236. 29 x  x (x + 1)39. x (x + 1)  x (x + 1)40. x(x + 1) 1  1 (x + 1) 37. x (x2 – 1)41. x(x + 1) (x – 1)  x (x + 1)38. x21 – 1 Exercise D. Take the denominators of out of the radical. 42. 9x21 – 143.