Let f(x)=−(3x^3+8)
(a) List the critical point(s) of f=
(b) f′(x)>0f′(x)>0 for x∈=
(c) f′(x)<0f′(x)<0 for x∈=
Note: the answers to the above questions can bea value, a list of values, an interval, a union of intervals, or\"NONE\" if no values exist.
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