Question

The width of a rectangle is 7 inches less than its length. The area of the rectangle is 120 square inches. Solve for the dimensions of the rectangle.

Length:______ a0 inches

Width: _______a1 inches

Answer 1

Length is 15 inches

Width is 8 inches

Explanation:

A = L*W

the Width = L-7

120 = L (L-7)

120 = L^2-7L

subtract 120 from each side

0 = L^2 - 7L - 120

(L-15) (L +8 )

so L = 15 inches

and W = 15-7 = 8 inches

check your answer: does 15*8 = 120? yes!