Algebra help pleaseee!?

Question

how do you doo..

(13 + h) ( 12 - h)

directions are to multiply.

the h^2 in front must be positive but it comes out negative..how do i make it positive ? thanks!

Answer 1

156+12h-13h-h^2

156-h-h^2

-(-156+h+h^2)

= -(h^2+h-156)

Answer 2

IF it's negative, you can't make it positive since we're dealing with an expression and not an equation. With an equation, you can multiply both sides by -1 to get rid of the negative on the terms you want to make positive.

(13+h)(12-h)=156+13h-12h-h^2

                 = -h^2+h+156

Answer 3

Well if it's equal to 0...

156-h-h^2=0

then you can go....

0=h^2+h-156

Answer 4

you have to use FOIL.

First: 13x12= 156

Outside:13x-h= -13h

Inside: hx12= 12h

Last: hx-h=-h^2

-h^2-h+156.  

it's product cannot be made into h^2-h-156. impossible.

Answer 5

(13 + h) * (12 - h)

= 13*12 + 12h - 13h - h^2

= 156 - h - h^2

= - (h^2 + h - 156)<==ANSWER