Friday

August 22, 2014

August 22, 2014

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:)

**Related Questions**

simple question - If an answer is to be 2 decimal places and the answer is 244....

Fundamentals of Taxation - Hamad is an employee of Mountain Company. He properly...

Tax - Hamad is an employee of Mountain Company. He properly completed his Form ...

Tax - Hamad is an employee of Mountain Company. He properly completed his Form ...

income tax - Hamad is an employee of Mountain Company. He properly completed his...

Calculus - another question - "Find the absolute minimum value of the function f...

Chemistry - please check my answers. THANK YOU. 1) The percent by mass of carbon...

Chemistry - The vapor pressure of chloroform is 173.11 mm Hg at 25 degrees ...

Chemistry(Please help) - The vapor pressure of chloroform is 173.11 mm Hg at 25...

Chemistry - The vapor pressure of chloroform is 173.11 mm Hg at 25 degrees ...