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March 26, 2015

March 26, 2015

Posted by **Hannah** on Sunday, February 27, 2011 at 9:03pm.

p(x)= (28+x)(8-x/4)

the answer was p=244-7x+8x-x^2/4

p=-x^2/4 + x + 244

p'= -x/2 +1 = 0

X=2

My question is, I do not understand how they got -7x + 8x at the beginning. I know (28)(8)=244 but I do not get the rest.

- Math -
**MathMate**, Sunday, February 27, 2011 at 9:09pmUse FOIL:

(28+x)(8-x/4)

=28*8 -28*x/4 + 8*x -x*x/4

=244 -7x + 8x -x²/4

=244 + x -x²/4

and the rest follows.

- Math -
**Hannah**, Sunday, February 27, 2011 at 9:21pmOh I see. I made a mistake with the 28 (x/4). Thanks!

- Math :) -
**MathMate**, Sunday, February 27, 2011 at 10:22pm:)

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