- #1

- 102

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## Homework Statement

[PLAIN]http://img651.imageshack.us/img651/2219/unledybi.jpg [Broken]

can someone teach me how to do it ?

answer is k=1/2,-7/17

thanks

## Homework Equations

## The Attempt at a Solution

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- Thread starter Suy
- Start date

- #1

- 102

- 0

[PLAIN]http://img651.imageshack.us/img651/2219/unledybi.jpg [Broken]

can someone teach me how to do it ?

answer is k=1/2,-7/17

thanks

Last edited by a moderator:

- #2

- 179

- 0

assuming [itex]|k|<1[/itex]

[tex](3-27k)(\frac{1}{1-k^2}-1)=-7k[/tex]

Now multiply with [itex](1-k^2) [/itex] and use your favorite CAS program to get

[tex]-3(-1+9k)k=7(-1+k^2)[/tex]

Now solve for k

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