Question

If x2 + y2 = 100, and xy = 18, find the value of x - y. How do I solve this?

Answer 1

@waterineyes

Answer 2

\[(x-y)^2 = x^2 + y^2 - 2xy\]

Answer 3

\[(x-y)^2 = 64 \implies (x-y) = \pm 8\]