1. The problem statement, all variables and given/known data Find an eqn for the plane tangent to the given surface at the specified point. x = u^2 - v^2 y= u +v z = u^2 + 4v At (-1/4, 1/2, 2) 2. Relevant equations A(x-x_0) + B(y-y_0) + C(z-z_0) 3. The attempt at a solution I thought that I could simply use x = u^2 - v^2 as A, and y = u + v as B, etc. But yeah, it's wrong obviously. I looked through my notes already and my professor didn't go over this so I'm entirely lost. How do I find the plane tangent without knowing what u and v are? Pls help, having a headache over this. The examples in the book didn't help at all either....it didn't have any examples on this.