Question #2755

1- f(x) = 2x3 - 6x + 3
2- f(x) = -5x2+5x+8
3- f(x) = 4/ x2 +4x+8
4- f(x) =(x2 + 9)1/2
for the above find the critical points and intervals on which the function is increasing and decreasing then identify the local extreme values of the function , if any saying where they are taken on ?

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