Question: In Problems a to c, a function f is given with domain (-, ), Indicate where f is uncreasing and where it is concave down.

In Problems a to c, a function f is given with domain (-∞, ∞), Indicate where f is uncreasing and where it is concave down.
a. f(x) = 3x - x2
b. f(x) = x9
c. f(x) = x3 - 3x + 3

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