To find area, you use: L×W=A We know the area, so let's plug that in. L×W=15 We also received more information. Let's say the length is the longer side. L=W+2 Let's plug that in for L. W(W+2)=15 W²+2W=15 You can find W by putting it in a graph. You could also solve by guessing and checking. So, the shorter side is 3 inches long.