The functionf(x)= x^3 + ax˛ + bx has a local minimum at x=3 and a point of inflection at x = -1. Find the values ofaandb.

I don't even know where to begin on this problem; any help is appreciated.

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- January 16th 2009, 07:17 AMh4hv4hd4si4nfind a and b given point of inflection and local min.
The function

*f(x)*= x^3 + ax˛ + bx has a local minimum at x=3 and a point of inflection at x = -1. Find the values of*a*and*b*.

I don't even know where to begin on this problem; any help is appreciated. - January 16th 2009, 07:32 AMearboth
- January 16th 2009, 07:40 AMh4hv4hd4si4n
I got a = 3 and b = -45

is that correct? - January 16th 2009, 07:44 AMearboth
- January 16th 2009, 07:46 AMh4hv4hd4si4n
thanks for your help