If the sum of a number and its square is 240, what is the number?	Choose the correct choice from the following answers:
A) 15
B) 77
C) 25
D) 87
E) 171

Rationale: "explanation : let the integer be x . then , x + x 2 = 240 x 2 + x - 240 = 0 ( x + 16 ) ( x – 15 ) = 0 x = 15 answer : a"
Answer: A