Find equation of the tangent plane

  1. Find the equation of the tangent plane to the level surface of the scalar field

    [tex]\xi[/tex](x,y,z) = x2+y2+z2

    at the point (1,1,2)

    Looking the work through this question with someone, not to sure where to start.
  2. jcsd
  3. lanedance

    lanedance 3,307
    Homework Helper

    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
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