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- #1

- Jan 29, 2012

- 661

**David's question at Yahoo! Answers (horizontal tangent plane).**

Here is the question:

Here is a link to the question:Find the point(s) on the surface at which the tangent plane is horizontal.? z = 3 − x^2 − y^2 + 8y

(x, y, z) = ( )

Find the point(s) on the surface at which the tangent plane is horizontal.? - Yahoo! Answers

I have posted a link there to this topic so the OP can find my response.

**Of course I meant in the title**

P.S.

P.S.

*tangent*instead of

*tangente*(It is hard to forget our mother tongue).

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