Find equation of the tangent plane

[andrey21]

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.

 

[lanedance]

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