If the sum of a number and its square is 306, What is the number?  Answers:
A) 16
B) 77
C) 25
D) 17
E) 171

Rationale: "explanation : let the integer be x . then , x + x 2 = 306 x 2 + x - 306 = 0 ( x + 18 ) ( x – 17 ) = 0 x = 17 answer : d"
Answer: D