Question

If 3x2+3y2=42 and xy= -15, find the value of (x-y)2

Answer 1

was the other answer right?

Answer 2

44

Explanation:

x^2 + y^2 = 14

(x-y)^2 x^2 + y^2 - 2xy = 14 -2 * (-15) = 44