Question

Could someone please check me and tell me if I'm right?!

A rectangle's length is 4 feet more than its width. If the area of the rectangle is 396 square feet, what is its width, in feet?

I got 18, could someone tell me if I'm correct, and if not, tell me what the answer is or help guide me to it?

Answer 1

it looks right to me

Answer 2

L = 4 + W
A = L*W=368
= (4+W)*W
W^2 + 4W -368 =0

W= 2 (sqrt(93)-1) = 17.28, using only the positive root-

http://www.wolframalpha.com/input/?i=W%5E2+%2B+4W+-368

Answer 3

http://www.wolframalpha.com/input/?i=W^2+%2B+4W+-396 Ans. 18 as you concluded.