Multiplying a Binomial by a Binomial

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# Multiplying a Binomial by a Binomial - PowerPoint PPT Presentation

Multiplying a Binomial by a Binomial. The FOIL Method. Today’s Objective:. Review homework answers Multiply a binomial by a binomial using the FOIL method. Homework # 104 odds Answers. 4a 2 + 3z 3. 2x 2 – 5x 5. -3n 3 – 6n 2

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### Multiplying a Binomial by a Binomial

The FOIL Method

Today’s Objective:
• Multiply a binomial by a binomial using the FOIL method
• 4a2 + 3z 3. 2x2 – 5x 5. -3n3 – 6n2
• 15x3 – 3x2 + 12x 9. 8b3 + 36b2 – 4b
• 4m4 + 6m3 – 10m2 13. 3w2 + 7w 15. -2p2 + 3p
• 3x3 + 8x 19. -22b2 + 2b + 8 21. a = -7

25. m = -2

What does FOIL stand for?

FOIL is an acronym that stands for

F – first

O- outer

I – inner

L – last

So what does that help me do?

FIRST

(x + 3)(x – 4)

The terms in red are first terms.

Multiply them. (x)(x) x2

OUTER

(x + 3)(x–4)

The terms in red are the outer terms.

Multiply them. (x)(-4) -4x

INNER

(x + 3)(x– 4)

The terms in red are the inner terms.

Multiply them. (3)(x) 3x

LAST

(x + 3)(x– 4)

The terms in red are the last terms.

Multiply them. (3)(-4) -12

Now combine like terms.

First = x2 Outer = -4x Inner = 3x Last = -12

x2 – x – 12

Classwork
• Complete p. 19 as classwork, check answers with Ms. Cruz