If the sum of a number and its square is 72, what is the number? Choose one
A) 15  B) 26  C) 8  D) 91  E) none of these

Rationale: "let the number be x . then , x + x 2 = 72 ( x + 9 ) ( x - 8 ) = 0 x = 8 answer : c"
Answer: C