To multiply polynomials, one can use the distributive property by distributing one polynomial over the other, the FOIL method for multiplying binomials by multiplying the First, Outer, Inner, and Last terms, or the box method which involves drawing a box and distributing the terms. All three methods yield the same result but use different approaches to arrive at the final polynomial. The document provides examples of multiplying polynomials using each method along with step-by-step explanations and instructions.
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Lesson 7-7FOILPPT.ppt
1. Objective
The student will be able to:
multiply two polynomials using the
FOIL method, Box method and the
distributive property.
2. There are three techniques you can
use for multiplying polynomials.
The best part about it is that they are all the
same! Huh? Whaddaya mean?
It’s all about how you write it…Here they are!
1)Distributive Property
2)FOIL
3)Box Method
Make sure to write this down!
3. 1) Multiply. (2x + 3)(5x + 8)
Using the distributive property, multiply
2x(5x + 8) + 3(5x + 8).
10x2 + 16x + 15x + 24
Combine like terms.
10x2 + 31x + 24
A shortcut of the distributive property is
called the FOIL method.
4. The FOIL method is ONLY used when
you multiply 2 binomials. It is an
acronym and tells you which terms to
multiply.
2) Use the FOIL method to multiply the
following binomials:
(y + 3)(y + 7).
5. (y + 3)(y + 7).
F tells you to multiply the FIRST
terms of each binomial.
y2
6. (y + 3)(y + 7).
O tells you to multiply the OUTER
terms of each binomial.
y2 + 7y
7. (y + 3)(y + 7).
I tells you to multiply the INNER
terms of each binomial.
y2 + 7y + 3y
8. (y + 3)(y + 7).
L tells you to multiply the LAST
terms of each binomial.
y2 + 7y + 3y + 21
Combine like terms.
y2 + 10y + 21
9. Remember, FOIL reminds you to
multiply the:
First terms
Outer terms
Inner terms
Last terms
10. The third method is the Box Method.
This method works for every problem!
Here’s how you do it.
Multiply (3x – 5)(5x + 2)
Draw a box. Write a
polynomial on the top and
side of a box. It does not
matter which goes where.
This will be modeled in the
next problem along with
FOIL.
3x -5
5x
+2
11. 3) Multiply (3x - 5)(5x + 2)
First terms:
Outer terms:
Inner terms:
Last terms:
Combine like terms.
15x2 - 19x – 10
3x -5
5x
+2
15x2
+6x
-25x
-10
You have 3 techniques. Pick the one you like the best!
15x2
+6x
-25x
-10
15. 5) Multiply (2x - 5)(x2 - 5x + 4)
You cannot use FOIL because they are
not BOTH binomials. You must use the
distributive property.
2x(x2 - 5x + 4) - 5(x2 - 5x + 4)
2x3 - 10x2 + 8x - 5x2 + 25x - 20
Group and combine like terms.
2x3 - 10x2 - 5x2 + 8x + 25x - 20
2x3 - 15x2 + 33x - 20
16. x2 -5x +4
2x
-5
5) Multiply (2x - 5)(x2 - 5x + 4)
You cannot use FOIL because they are not BOTH
binomials. You must use the distributive property or
box method.
2x3
-5x2
-10x2
+25x
+8x
-20
Almost
done!
Go to
the next
slide!
