Posted by Dan on Sunday, December 19, 2010 at 2:10pm.
f' = 4 x^3 -8 x = 4x (x^2-2)
zero at x = 0 and x = sqrt 2 and x=-sqrt 2
f" = 12 x^2 - 8
at zero this is -8 so a maximum
at +sqrt 2 this is +16
same at -sqrt2 so those are minima
Huge positive for x large positive and for x large negative
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