Area = length * width ( X for both length and width )

X(X - 4) = 96

X^2 - 4X = 96

X^2 - 4X - 96 = 0

(X + 8)(X - 12)

From this (discarding negative factor ) we see that...,

**X = 12 feet**

**X - 4 = 8 feet**

**------**

Perimeter = 2L + 2W

So, the perimeter is easy for you to find!