Determining Concavity From the First Derivative
The first derivative of a function $$f$$ is given by $$ f'(x) = x^4 - 6x^2 - 8x - 3 $$. On which of the following intervals is the graph of $$f$$ concave up?
A
$$ (2, \infty) $$ only
B
$$ (-\infty, -1) $$ and $$ (3, \infty) $$
C
$$ (0, \infty) $$
D
$$ (-1, 2) $$
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