Help finding curvatures of x(u,v)?

I have a homework due in about 9 hours and I really need help, I don't understand how to do these types of problems and the professor is really hard to understand.

The function is x(u,v) = (u+v, u-v, uv), at the point P = (2,0,1)

The question says to Find the Gauss curvature, mean curvature, principal curvatures and the corre-sponding principal directions of the function.

I've gone through this but there's just so many calculations to do and I feel like I must've messed up somewhere.

I know that in order to find all these things, you need the first and second fundamental forms, along with the principal normal.

Can someone please help me?

Re: Help finding curvatures of x(u,v)?

Even if you open this thread past the time when my homework is due, please still answer it if you can.

Thank You