## Find equation of the tangent plane

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

$$\xi$$(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.
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 Recognitions: Homework Help 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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