math
posted by Michael on .
If the area of a rectangle is 84 square inches.How do i find its length and width? Length is (x+3) width is (x2).

area = length*width
(x+3)(x2) = 84
x^2 + x  6 = 84
x^2 + x  90 = 0
(x+10)(x9) = 0
x=9, so
length=12
width=7