1. The problem statement, all variables and given/known data Prove: |xy| = |x| * |y|? 2. Relevant equations |x| = sqrt(x^2) 3. The attempt at a solution (|xy|)^2 = (|x| * |y|)^2 x^2y^2 = x^2 y^2 ---I think this is incorrect though. Really, I don't understand proofs and the concept of proofing.