Question 496771
A = 1/2 b*h
20 =1/2 b* h
40 = b*h
40 = (x + 2) * x
40 = x^2 + 2x

x^2 + 2x - 40 = 0
Next, use the quadratic formula.
7.4 is the height.
5.4 is the base.
7.4 * 5.4 = 39.96 approx 40; 40 / 2 = 20.
This does check.
Cleomenius.