Chapter0 reviewofalgebra-151003150137-lva1-app6891

INTRODUCTORY MATHEMATICALINTRODUCTORY MATHEMATICAL
ANALYSISANALYSISFor Business, Economics, and the Life and Social Sciences
©2007 Pearson Education Asia
Chapter 0Chapter 0
Review of AlgebraReview of Algebra

INTRODUCTORY MATHEMATICAL
ANALYSIS
0. Review of Algebra
1. Applications and More Algebra
2. Functions and Graphs
3. Lines, Parabolas, and Systems
4. Exponential and Logarithmic Functions
5. Mathematics of Finance
6. Matrix Algebra
7. Linear Programming
8. Introduction to Probability and Statistics

9. Additional Topics in Probability
10. Limits and Continuity
11. Differentiation
12. Additional Differentiation Topics
13. Curve Sketching
14. Integration
15. Methods and Applications of Integration
16. Continuous Random Variables
17. Multivariable Calculus
INTRODUCTORY MATHEMATICAL
ANALYSIS

• To be familiar with sets, real numbers, real-number line.
• To relate properties of real numbers in terms of their
operations.
• To review the procedure of rationalizing the
denominator.
• To perform operations of algebraic expressions.
• To state basic rules for factoring.
• To rationalize the denominator of a fraction.
• To solve linear equations.
• To solve quadratic equations.
Chapter 0: Review of Algebra
Chapter ObjectivesChapter Objectives

Sets of Real Numbers
Some Properties of Real Numbers
Exponents and Radicals
Operations with Algebraic Expressions
Factoring
Fractions
Equations, in Particular Linear Equations
Quadratic Equations
Chapter OutlineChapter Outline
0.1)
0.2)
0.3)
0.4)
0.5)
0.6)
0.7)
0.8)

• A set is a collection of objects.
• An object in a set is called an element of that
set.
• Different type of integers:
• The real-number line is shown as
0.1 Sets of Real Numbers0.1 Sets of Real Numbers
{ }...,3,2,1=integerspositiveofSet
{ }1,2,3..., −−−=integersnegativeofSet

• Important properties of real numbers
1. The Transitive Property of Equality
2. The Closure Properties of Addition and
Multiplication
3. The Commutative Properties of Addition
and Multiplication
0.2 Some Properties of Real Numbers0.2 Some Properties of Real Numbers
.then,andIf cacbba ===
.and
numbersrealuniquearetherenumbers,realallFor
abba +
baababba =+=+ and

4. The Commutative Properties of Addition
and Multiplication
5. The Identity Properties
6. The Inverse Properties
7. The Distributive Properties
0.2 Some Properties of Real Numbers
( ) ( ) ( ) ( )cabbcacbacba =++=++ and
aaaa ==+ 1and0
( ) 0=−+ aa 11
=⋅ −
aa
( ) ( ) cabaacbacabcba +=++=+ and

Example 1 – Applying Properties of Real Numbers
Example 3 – Applying Properties of Real
Numbers
( ) ( )
( ) ( )354543b.
2323a.
⋅=⋅
+−=+− xwzywzyxSolution:
a. Show that
Solution:
.0for ≠





= c
c
b
a
c
ab
( ) 





=





⋅=⋅=
c
b
a
c
ba
c
ab
c
ab 11

Example 3 – Applying Properties of Real Numbers
b. Show that
Solution:
.0for
c
b
≠+=
+
c
c
a
c
ba
( )
c
b
c
a
c
ba
c
ba 111
⋅+⋅=+=
+
c
b
c
a
c
ba
c
b
c
a
c
b
c
a
+=
+
+=⋅+⋅
11

• Properties:
0.3 Exponents and Radicals0.3 Exponents and Radicals
14.
1
3.
0for
11
2.
1.
0
=
=
≠
⋅⋅
==
⋅⋅=
−
−
x
x
x
x
xxxxx
x
xxxxx
n
n
factorsn
n
n
factorsn
n
 
 
n
x
exponent
base

0.3 Exponents and Radicals
Example 1 – Exponents
xx
π
=
=−==
==
==






=























=





1
000
5
5-
5
5-
4
e.
1)5(,1,12d.
2433
3
1
c.
243
1
3
1
3b.
16
1
2
1
2
1
2
1
2
1
2
1
a.

• The symbol is called a radical.
n is the index, x is the radicand, and is the
radical sign.
n
x

Example 3 – Rationalizing Denominators
Solution:
( )
x
x
x
x
xxx 3
32
3
32
3
2
3
2
3
2
b.
5
52
5
52
55
52
5
2
5
2
a.
6 55
6 566 5
1
6
1
6
5
6
1
2
1
2
1
2
1
2
1
2
1
===
⋅
=
=
⋅
=
⋅
⋅
==
a. Eliminate negative exponents in and
simplify.
Solution:
11 −−
+ yx
xy
xy
yx
yx
+
=+=+ −− 1111

b. Simplify by using the distributive law.
Solution:
c. Eliminate negative exponents in
Solution:
( )12/12/12/3
−=− xxxx
2/12/3
xx −
( ) .77
22 −−
+ xx
( )
( ) 2222
22
49
17
7
17
77
xxxx
xx +=+=+
−−

d. Eliminate negative exponents in
Solution:
e. Apply the distributive law to
Solution:
( ) .
211 −−−
− yx
( )
( )2
222
22
211 11
xy
yx
xy
xy
xy
xy
yx
yx
−
=





−
=





 −
=





−=−
−−
−−−
( ).2 5
6
2
1
5
2
xyx +
( ) 5
8
2
1
5
2
5
6
2
1
5
2
22 xyxxyx +=+

Example 7 – Radicals
a. Simplify
Solution:
b. Simplify
Solution:
3233 33 323 46
)( yyxyyxyx =⋅⋅=
7
14
77
72
7
2
=
⋅
⋅
=
.3 46
yx
.
7
2

Example 7 – Radicals
c. Simplify
Solution:
d. If x is any real number, simplify
Solution:
Thus, and
210105
2152510521550250
+=
+−=+−
.21550250 +−
.2
x



<−
≥
=
0if
0if2
xx
xx
x
222
= ( ) .33
2
=−

• If symbols are combined by any or all of the
operations, the resulting expression is called
an algebraic expression.
• A polynomial in x is an algebraic expression
of the form:
where n = non-negative integer
cn = constants
0.4 Operations with Algebraic Expressions0.4 Operations with Algebraic Expressions
01
1
1 cxcxcxc n
n
n
n ++++ −
− 

0.4 Operations with Algebraic Expressions
Example 1 – Algebraic Expressions
a. is an algebraic expression in the
variable x.
b. is an algebraic expression in the
variable y.
c. is an algebraic expression in the
variables x and y.
3
3
10
253
x
xx
−
−−
( ) 2
3
+
−+
y
xyyx
2
7
5
310
y
y
+
+−

Example 3 – Subtracting Algebraic Expressions
Simplify
Solution:
( ) ( ).364123 22
−+−+− xyxxyx
( ) ( )
( ) ( )
48
316243
)364()123(
364123
2
2
22
22
+−−=
++−−+−=
+−−++−=
−+−+−
xyx
xyx
xyxxyx
xyxxyx

• A list of products may be obtained from the
distributive property:

Example 5 – Special Products
a. By Rule 2,
b. By Rule 3,
( )( )
( ) ( )
103
5252
52
2
2
−−=
−+−+=
−+
xx
xx
xx
( )( )
( )
204721
45754373
4753
2
2
+−=
⋅+⋅+⋅+⋅=
++
zz
zz
zz

Example 5 – Special Products
c. By Rule 5,
d. By Rule 6,
e. By Rule 7,
( )
( )
168
442
4
2
22
2
+−=
+−=
−
xx
xx
x
( )( )
( )
8
31
3131
2
2
2
2
22
−=
−+=
−+++
y
y
yy
( )
( ) ( )( ) ( ) ( ) ( )
8365427
23233233
23
23
3223
3
+++=
+++=
+
xxx
xxx
x

Example 7 – Dividing a Multinomial by a Monomial
z
zz
z
zzz
x
x
xx
3
2
3
42
2
6384
b.
3
3
a.
2
23
2
3
−+−=
−+−
+=
+

• If two or more expressions are multiplied
together, the expressions are called the
factors of the product.
0.5 Factoring0.5 Factoring

0.5 Factoring
Example 1 – Common Factors
a. Factor completely.
Solution:
b. Factor completely.
Solution:
xkxk 322
93 +
( )kxxkxkxk 3393 2322
+=+
224432325
268 zxybayzbayxa −−
( )24232232
224432325
342
268
xyzbazbyxaya
zxybayzbayxa
−−=
−−

0.5 Factoring
Example 3 – Factoring
( )
( )( )
( )( )
( )
( )zzzz
xxx
yyyyyy
xxxx
xxx
+=+
−=+−
+−=−+
++=++
+=++
1e.
396d.
23231836c.
2313299b.
4168a.
4/14/54/1
22
23
2
42
( )( )( )
( )( )
( )( )( )
( )( )
( )( )
( )( )( )( )2222
333366
23
2222
3/13/13/13/2
24
j.
2428i.
bbaah.
4145g.
1111f.
yxyxyxyxyxyx
yxyxyx
xxxx
bayxyxyxyx
xxxx
xxxx
++−+−+=
−+=−
++−=−
+−+=−+−
−−=+−
−++=−

Simplifying Fractions
• Allows us to multiply/divide the numerator and
denominator by the same nonzero quantity.
Multiplication and Division of Fractions
• The rule for multiplying and dividing is
0.6 Fractions0.6 Fractions
bd
ac
d
c
b
a
=











bc
ad
d
c
b
a
=÷

Rationalizing the Denominator
• For a denominator with square roots, it may be
rationalized by multiplying an expression that
makes the denominator a difference of two
squares.
Addition and Subtraction of Fractions
• If we add two fractions having the same
denominator, we get a fraction whose
denominator is the common denominator.
0.6 Fractions

0.6 Fractions
Example 1 – Simplifying Fractions
a. Simplify
Solution:
b. Simplify
Solution:
.
127
6
2
2
+−
−−
xx
xx
( )( )
( )( ) 4
2
43
23
127
6
2
2
−
+
=
−−
+−
=
+−
−−
x
x
xx
xx
xx
xx
.
448
862
2
2
xx
xx
−−
−+
( )( )
( )( ) ( )22
4
214
412
448
862
2
2
+
+
=
+−
+−
=
−−
−+
x
x
xx
xx
xx
xx

0.6 Fractions
Example 3 – Dividing Fractions
( )
( )( )
( )
( )( )41
2
82
1
1
4
1
82
1
4
c.
32
5
2
1
3
5
2
3
5
b.
32
5
3
5
25
3
2
a.
222
2
++
=
+
−
⋅
−
=
−
+
−
−
−
=⋅
−
−
=−
−
++
−
=
+
−
⋅
+
=
−
+
÷
+
xxxx
x
x
x
x
xx
x
x
xx
x
xx
x
x
x
x
xx
xx
x
x
x
x
x
x
x
x

0.6 Fractions
Example 5 – Adding and Subtracting Fractions
( ) ( )
2
33
2
235
2
23
2
5
a.
2
2
2
−
−+
=
−
++−
=
−
+
+
−
−
p
pp
p
pp
p
p
p
p
( )( )
( )( )
( )
( )( )
3
4
32
2
31
41
65
2
32
45
b. 2
2
2
2
+
−=
++
+
−
+−
−−
=
++
+
−
−+
+−
x
xx
xx
xx
xx
xx
xx
xx
xx
( ) ( ) ( )
1
7
7
7
425
149
84
7
2
7
5
c.
22
2
22
=
−
−
=
−
−+−−−+
=
+−
+−
+
−
−
−
−
−+
x
x
x
xxx
xx
x
x
x
x
xx

0.6 Fractions
Example 7 – Subtracting Fractions
( )
( )( )( ) ( )( )
( ) ( )
( ) ( )
( ) ( )332
615
332
6512102
332
32322
92
2
96
2
2
2
2
22
222
−+
+−
=
−+
−−−+−
=
−+
++−−−
=
−
+
−
++
−
xx
xx
xx
xxxx
xx
xxxx
x
x
xx
x

Equations
• An equation is a statement that two
expressions are equal.
• The two expressions that make up an equation
are called its sides.
• They are separated by the equality sign, =.
0.7 Equations, in Particular Linear Equations0.7 Equations, in Particular Linear Equations

0.7 Equations, in Particular Linear Equations
Example 1 – Examples of Equations
zw
y
y
xx
x
−=
=
−
=++
=+
7d.
6
4
c.
023b.
32a.
2
• A variable (e.g. x, y) is a symbol that can be
replaced by any one of a set of different
numbers.

Equivalent Equations
• Two equations are said to be equivalent if they
have exactly the same solutions.
• There are three operations that guarantee
equivalence:
1. Adding/subtracting the same polynomial
to/from both sides of an equation.
2. Multiplying/dividing both sides of an
equation by the same nonzero constant.
3. Replacing either side of an equation by an
equal expression.

Operations That May Not Produce Equivalent
Equations
4. Multiplying both sides of an equation by an
expression involving the variable.
5. Dividing both sides of an equation by an
expression involving the variable.
6. Raising both sides of an equation to equal
powers.

Linear Equations
• A linear equation in the variable x can be
written in the form
where a and b are constants and .
• A linear equation is also called a first-degree
equation or an equation of degree one.
0=+ bax
0≠a

Example 3 – Solving a Linear Equation
Solve
Solution:
.365 xx =−
( ) ( )
3
2
6
2
2
62
60662
062
33365
365
=
=
=
+=+−
=−
−+=−+−
=−
x
x
x
x
x
xxxx
xx

Example 5 – Solving a Linear Equations
Solve
Solution:
.6
4
89
2
37
=
−
−
+ xx
( )
( ) ( )
2
105
24145
2489372
64
4
89
2
37
4
=
=
=+
=−−+
=




 −
−
+
x
x
x
xx
xx

Literal Equations
• Equations where constants are not specified,
but are represented as a, b, c, d, etc. are
called literal equations.
• The letters are called literal constants.

Example 7 – Solving a Literal Equation
Solve for x.
Solution:
( ) ( )
( )
ac
a
x
aacx
aaxxxcxax
axxxca
−
=
=−
++=++
+=++
2
2
222
22
2
( ) ( )22
axxxca +=++

Example 9 – Solving a Fractional Equation
Solve
Solution:
Fractional Equations
• A fractional equation is an equation in which
an unknown is in a denominator.
.
3
6
4
5
−
=
− xx
( )( ) ( )( )
( ) ( )
x
xx
x
xx
x
xx
=
−=−






−
−−=





−
−−
9
4635
3
6
34
4
5
34

Example 11 – Literal Equation
If express u in terms of the remaining
letters; that is, solve for u.
Solution:
,
vau
u
s
+
=
( )
( )
sa
sv
u
svsau
usvsau
uvaus
vau
u
s
−
=
−=−
=+
=+
+
=
1
1

Radical Equations
• A radical equation is one in which an unknown
occurs in a radicand.
Example 13 – Solving a Radical Equation
Solve
Solution:
.33 −=−− yy
4
2
126
963
33
=
=
=
+−=−
−=−−
y
y
y
yyy
yy

• A quadratic equation in the variable x is an
equation that can be written in the form
where a, b, and c are constants and
• A quadratic equation is also called a second-
degree equation or an equation of degree two.
0.8 Quadratic Equations0.8 Quadratic Equations
02
=++ cbxax
.0≠a

0.8 Quadratic Equations
Example 1 – Solving a Quadratic Equation by Factoring
a. Solve
Solution:
Factor the left side factor:
Whenever the product of two or more quantities
is zero, at least one of the quantities must be
zero.
.0122
=−+ xx
( )( ) 043 =+− xx
( ) ( )
43
04or03
−==
=+=−
xx
xx

Example 1 – Solving a Quadratic Equation by Factoring
b. Solve
Solution:
.56 2
ww =
( )
6
5
or0
056
56 2
==
=−
=
ww
ww
ww

Example 3 – Solving a Higher-Degree Equation by
Factoring
a. Solve
Solution:
b. Solve
Solution:
.044 3
=− xx
( )
( )( )
1or1or0
0114
014
044
2
3
−===
=+−
=−
=−
xxx
xxx
xx
xx
( ) ( ) ( ) .0252
32
=++++ xxxxx
( ) ( ) ( )
( ) ( ) ( )[ ]
( ) ( )
7/2or2or0
0722
0252
0252
2
2
32
−=−==
=++
=++++
=++++
xxx
xxx
xxxx
xxxxx

Example 5 – Solution by Factoring
Solve
Solution:
.32
=x
( )( )
3Thus,
3or3
033
03
3
2
2
±=
−==
=+−
=−
=
x
xx
xx
x
x

Quadratic Formula
• The roots of the quadratic equation
can be given as
02
=++ cbxax
a
acbb
x
2
42
−±−
=

Example 7 – A Quadratic Equation with One Real Root
Solve by the quadratic formula.
Solution:
Here a = 9, b = 6√2, and c = 2. The roots are
09262 2
=++ yy
( )
3
2
18
026
or
3
2
18
026
92
026
−=
−−
=−=
+−
=
±−
=
yy
y

Quadratic-Form Equation
• When a non-quadratic equation can be
transformed into a quadratic equation by an
appropriate substitution, the given equation is
said to have quadratic-form.

Example 9 –– Solving a Quadratic-Form Equation
Solve
Solution:
This equation can be written as
Substituting w =1/x3
, we have
Thus, the roots are
.08
91
36
=++
xx
08
1
9
1
3
2
3
=+





+





xx
( )( )
1or8
018
0892
−=−=
=++
=++
ww
ww
ww
1or
2
1
1
1
or8
1
33
−=−=
−=−=
xx
xx

Chapter0 reviewofalgebra-151003150137-lva1-app6891

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