If x^2 + y^2 = 15 and xy = 3, then (x − y)^2 = Pick one:
A) 8 B) 9 C) 14 D) 17 E) 20

Rationale: but you can not take xy + 3 to mean xy = - 3 . . only if xy + 3 = 0 , it will mean xy = - 3 . . rest your solution is perfect and you will get your correct answer as 15 - 2 * 3 = 9 . . answer b
Answer: B