A = (x + 1)( 3 − x) + (x + 1)(2 + 5x)
B = (x + 2)(x + 1) + (x + 2)(7x - 5)
C = (x + 3)(3 − 2x) - (x + 3)(5 + x)
D = (2x + 1)(x - 5)-(3x + 1)(2x + 1)