If x and y are perfect squares, then which four of the following is not necessarily a perfect square? Choose the correct choice:
A) x^2	B) xy	C) 4x	D) x+y	E) x^5
If x=y=1^2=1, then each option but E is a perfect square, therefore E is NOT necessarily a perfect square.   Answer: x^5.
<result>E</result>
If x and y are perfect squares, then which four of the following is not necessarily a perfect square?