Find the equation of the tangent plane to the level surface of the scalar field [tex]\xi[/tex](x,y,z) = x^{2}+y^{2}+z^{2} at the point (1,1,2) Looking the work through this question with someone, not to sure where to start.
i would start with the general equation of a plane... the tangent plane can be thought of as a linear approximation of the function at that point