- #1
Loppyfoot
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Homework Statement
Find all the points on the surface x^2+y^2-z^2=-1 where the tangent plane is perpendicular to the vector <1,0,2>.
I'm confused!
The Attempt at a Solution
So, the gradient would be: <2x,2y,-2z>, but what do I do with the gradient vector to find these points?
thanks in advance!