- #1

- 64

- 9

## Homework Statement

## Homework Equations

## The Attempt at a Solution

I got -1, but the answer says "6". Could you help me, please?

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- #1

- 64

- 9

I got -1, but the answer says "6". Could you help me, please?

- #2

Homework Helper

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I see a mistake in the x-partial. You have not substituted in correctly.

- #3

- 64

- 9

Oh, thanks! But then 3-3=0 and the whole thing is 0I see a mistake in the x-partial. You have not substituted in correctly.

- #4

Homework Helper

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PS. This is all the help I can give, sorry.

- #5

Homework Helper

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In the relevant equations, you have correctly given the equation of a plane. You can rewrite this asOh, thanks! But then 3-3=0 and the whole thing is 0

##(a, b, c) \cdot (x-x_0,y-y_0,z-z_0) = 0##

This says that ##(a, b, c)## is normal to all of the vectors in the plane.

If this plane is tangent to the surface described by ##(x, y,f(x,y))## at ##(x_0,y_0,z_0)##, then ##(a, b, c)## would also have to be normal to that surface at that point. How would you find the vector ##(a, b, c)## that is normal to the surface?

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