Question 178500
Since we know that area of any rectangle is:
"width" * "length"
.
We then have:
x(x-9) = 220
x^2 - 9x = 220 
x^2 - 9x - 220 =0
(x-20)(x+11) = 0
.
x = {20, -11}
.
We can toss out the negative solution leaving us with:
x = 20 feet
x-9 = 11 feet
.
Therefore, the dimensions are:
20 feet by 11 feet