- #1

- 4

- 0

tangent plane at P . Show that the surfaces z = √(2x²+2y²-1) and z = (1/3)√(x²+y²+4) are tangential at the point (1, 2, 3).

differentiate first then evaluate both at 1,2,3

You are using an out of date browser. It may not display this or other websites correctly.

You should upgrade or use an alternative browser.

You should upgrade or use an alternative browser.

- Thread starter dexza666
- Start date

- #1

- 4

- 0

tangent plane at P . Show that the surfaces z = √(2x²+2y²-1) and z = (1/3)√(x²+y²+4) are tangential at the point (1, 2, 3).

differentiate first then evaluate both at 1,2,3

- #2

HallsofIvy

Science Advisor

Homework Helper

- 41,847

- 966

First, I find it hard to believe this is not schoolwork and I am going to move it to the homework section.

Secondly you should understand that you must show some work and not just expect someone to tell you how to do it.

In fact, it looks like you have been told how to do it: "differentiate first then evaluate both at 1,2,3". Have you done that?

I must say that I foresee a serious problem in "showing that the surfaces are tangential at (1, 2, 3)"!! You might try first evaluating the second one at x= 1, y= 2. What do you get for z?

Secondly you should understand that you must show some work and not just expect someone to tell you how to do it.

In fact, it looks like you have been told how to do it: "differentiate first then evaluate both at 1,2,3". Have you done that?

I must say that I foresee a serious problem in "showing that the surfaces are tangential at (1, 2, 3)"!! You might try first evaluating the second one at x= 1, y= 2. What do you get for z?

Last edited by a moderator:

Share: