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 Post subject: Math Essentials - Page 86 Question 2Posted: Sat Jul 31, 2010 4:18 am

Joined: Sun Jul 25, 2010 10:53 am
Posts: 8
Hey,

What is the best way to solve Question 2 on Page 86 of the Math Essentials?

Help is much appreciated!

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 Post subject: Re: Math Essentials - Page 86 Question 2Posted: Sat Jul 31, 2010 7:09 pm

Joined: Thu May 06, 2010 3:17 pm
Posts: 28
Location: Everywhere
(12 +x + 38) (81 - 4x - 79)

Our first step is to rearrange the terms so we can add/subtract them as needed; it helps if we rewrite the second part in terms of addition, i.e. (81 + -4x + -79)

(x + 12 + 38) (-4x +81 + -79)

From there, we can add the integers, leaving us with

(x + 50) (-4x + 2)

Using FOIL, we multiply each term in the first set of parentheses by each term in the second set.

-4x^2 + 2x + -200x + 100

We can add our two middle terms

-4x^2 + -198x + 100

At this point, we are finished, but we can convert back into subtraction if needed:

100 - 198x - 4x^2

Bill

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 Post subject: Re: Math Essentials - Page 86 Question 2Posted: Sun Aug 01, 2010 1:25 am

Joined: Sun Jul 25, 2010 10:53 am
Posts: 8
Thanks!

Seemed harder than it actually was.

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