1. The problem statement, all variables and given/known data See http://mathworld.wolfram.com/DeltaFunction.html I want to show (6) on that page. I can show it using (7), but we aren't supposed to do that. I already proved (5), and my prof says to use the fact that (5) is true to get the answer. 2. Relevant equations 3. The attempt at a solution Here's what I tried: δ(x2 - a2) = δ((x-a)(x+a)) I'm not sure how to use (5), because here a is not multiplying x. I'm not sure where to go from here.