SOLUTION: the area of a rectangle is represented by x^2-4. If the perimeter is 40, find x.

Algebra ->  Rectangles -> SOLUTION: the area of a rectangle is represented by x^2-4. If the perimeter is 40, find x.       Log On

 

Hi,

     .

A = x^2-4

A = Lw = (x-2)(x-2)

P/2 = L + w = 20

(x-2) + (x+2) = 20

2x = 20

x = 10