Four of the following five parts numbered (a), (b), (c), (d) and (e) are exactly equal. The number of the part which is not equal to the other four parts is your answer.
Options:
(A) 2x2 3xy + y2
(B) (2x + y) (x y)
(C) (x y) 2 + x(x y)
(D) (2x y) 2 x(2x y)
(E) (2x y) 2 2x2 + xy Hmmm, my stream of consciousness:
Other parts are equal to
2x2 + y2 3xy. So, the answer is (B).