The length of a rectangle is 5 centimeters less than four times its width. Its area is 21 square centimeters. Find the dimensions of the rectangle

Answer 1

L = 4w-5

w(4w-5) = 21

4w^2 - 5w - 21 = 0

(4w + 7)(w - 3) = 0

4w+7=0 results in negative measures

w-3=0 --> w = 3

rectangle 7 x 3