OMG, did you try solving a cubic polynomial using the quadratic formula or what ?
Anyway, here's a start to simplification (I can't really do anything at the moment) : note that . Apply this to your equation with
Hello, Punch!
If this is a derivative, you lost a minus-sign . . .
I assume the original function is: /
Then: .
. . . . . . . .
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
Multiply top and bottom by
. . and we have: .
. . which simplifies to: .
And we have: .
. . Hence: .
But because of the in the function,
. . Therefore, the only critical value is: .