Homework Help: calculus

Posted by dee on Friday, March 9, 2007 at 11:14am.

relative extrema

x^3 + 1/2x^2 - 2x + 5

Ok I have
3x^2 + x - 2 = 0

Am I on the right track?

I think i know why I kept on asking for help with these pribelms. I forgot the step of factoring.

Please check...

3x^2 + x - 2 = 0
(3x-2)(x+1)=0
x=2/3, x=-1

Correct. Nice job.
If you calculate the second derivative (6x + 1) at those points, you can separate maxima from minima. The second derivative is negative at x = -1, making it a relative maximum.

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