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

phi · Answer

the area of a rectangle is length times width  or L*W

if L is (5x-3) and W is (x+7), the area is

(5x-3)(x+7)

can you multiply those ?  (Some people use FOIL)

phi · Answer

If you have time, here is a video that shows how http://www.khanacademy.org/math/algebra/multiplying-factoring-expression/multiplying-binomials/v/multiplying-binomials

anonymous · Answer

Thanks, gimme 1 sec to watch your video :)

anonymous · Answer

FOIL o_O