Question 21886: Find all relative extrema of the function:
f(x) = 1/3 x^3 - 4x + 9
I could not find simlar at all - any help is appreciated! Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! Methods depend on what math you are studying.
If calculus:
1st derivative is x^2-4
find the zeroes which are +2 and -2
2nd derivative is 2x
When x=2, 2x>0 so relative minimum at x=2
When x=-2, 2x<0 so relative maximum at x=-2
Cheers,
stan H.
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