15 times a positive integer is more than its square by 56, then the positive integer is
Select.
A) 13
B) 8
C) 11
D) 12
E) 14

Rationale: explanation : let the number be x . then , 15 x = x 2 + 56 = > x 2 - 15 x + 56 = 0 = > ( x - 7 ) ( x - 8 ) = 0 = > x = 7 or 8 answer : option b
Answer: B