7. For the function f(x) = 4x 3 + 3x2 − 6x + 1, D = (−∞, ∞) (a) Determine on which intervals f(x) is increasing or decreasing. (b) Find relative maximum and relative minimum values of f(x). (c) Determine intervals of concave upward and concave downward. (d) Find inflection point(s) of f(x) as an ordered pair (x, f(x)).

Q: ) Is the function f(x) = differentiable on the open interval (-1,1)? x².

A:

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A:

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