Which of the following represents the area of a rectangle whose length is 5x - 3 and whose width is
x + 7?
5x2 - 21
5x2 + 9x - 21
5x2 + 32x - 21
5x2 - 32x - 21

Question

Which of the following represents the area of a rectangle whose length is 5x - 3 and whose width is
x + 7?  
5x2 - 21
5x2 + 9x - 21
5x2 + 32x - 21
5x2 - 32x - 21

anonymous · Answer

Expand$$ (5x-3)(x+7) = 5x^2 + 32x - 21$$

anonymous · Answer

Area = length * width
$$(5x-3)(x+7)$$FOIL it
$$5x ^{2}+35x-3x-21$$
$$5x ^{2}-32x-21$$

anonymous · Answer

no this is right (5x−3)(x+7)=5x2+32x−21

anonymous · Answer

@deezil_wood: Check for the sign's ;)

anonymous · Answer

oh yeah duh don't know where that -32 came from lol

anonymous · Answer

$$35x-3x = +32x 
eq -32x $$

anonymous · Answer

it's happens, obvious typo :)

anonymous · Answer

Yes thx for the explanation :p

anonymous · Answer

you are welcome :P :D