Calc

"Consider the surface given by 4x^2-y^2+5z^2-10z=55.

a) Find all points on the surface at which the tangent plane is parallel to the plane 8x+y+15z=1.
b) Pick one of these points and give the equation of the tangent plane to the surface at that point."

Could someone help me with this? Thank you.

asked by Anonymous

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