algebra
posted by Lee .
A landscaper is designing a flower garden in the shape of a trapezoid. She wants the shorter base to be 3 yards greater than the height and the linger base to be 7 yards greater than the height. She wants the area to be 295 square yards. The situation is molded by the equation h^2+5h=295. Use quadratic formula to find the height that will give the desired area. Round to the nearest hundredth of a yard.
Could someone please explain.

I got 14.86 yards not sure if right