I hope someone can help me because i'm stumped

This problem is in the maths applied level 3 & 4.

The concrete slab in the shape of a rectangle shown on the right has an area of 63m^2. Form a Quadratic Equation and solve for "x" and then determine thewidthandlengthof the rectangle in order for it to be paved.

(you can't use trial and error or guessing)

http://img88.imageshack.us/my.php?im...entslabab0.jpg

Hope Someone can help me out

Cheers OLLiE