Recent content by brads

I figured out the first part of the problem the tangent plane to f(x,y) is 2x+2y-z-3=0. The normal vector of that plane is thus <2,2,-1>. I am lost on how to solve the next part, I keep trying different equations but coming up with too many variables.

Got a problem which should be easy but having trouble... "Find the equation of the tangent plane to z=f(x,y)=x^2 + y^2 - 1 at point (1,1,1) "Find an equation to a plane that is perpendicular to that tangent plane and also passes through the point (1,1,1) Thanks!