SAT Math Multiple Choice Practice Question 273: Answer and Explanation
9. If m and n are both squares of integers, which of the following is NOT necessarily the square of an integer?
Correct Answer: E
E Pick two perfect squares for m and n, like 4 and 9. Plugging these in to the examples gives (A) 36 (B) 36 (C) 16 (D) 324 (E) –45. The only choice that is not a perfect square is (E) –45.