Problem: if x ^ 2 + y ^ 2 = 20 and xy = 3 , then ( x − y ) ^ 2 =
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 20 - 2 * 3 = 14 . . answer c"
annotated_formula: power(3, 2)