Math Help - Lipschitz Function

1. Lipschitz Function

So my prof asked us to prove that f(x)=x2 is Lipschitz on the interval [-N, N] but didn't explain what that even means. Help!

2. Originally Posted by rufioxxpunkie
So my prof asked us to prove that f(x)=x2 is Lipschitz on the interval [-N, N] but didn't explain what that even means. Help!
You need to show $|f(x)-f(y)| \leq K|x-y|$ for some $K$.