Business Calculus question (HELP PLEASE!!)?

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hannah

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Let f(x)= 3x^5-20x^3

Given f ' (x)= 15x^2(x-2)(x+2)
((( f prime of x )))

and

f " (X) = 60x(x-1.41)(x+1.41)
((( f double prime of x )))
find:
1) all critical points
2) increasing intervals
3) decreasing intervals
4) relative max pt
5) relative min pt
6) points of inflection
7) interval of concave up
8) interval of concave down
 
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