If (x + 13)^2 = (3x + 7)(2x + 4), then find x^2.
(x + 13)^2 = (3x + 7)(2x + 4) =
x^2 + 26x + 169 = 6x^2 +26x +28
5x^2 = 141`
x^2 = 141/5
+37165 
