Single Variable Calculus

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Moderate

Find Intervals Where a Polynomial is Increasing

SVCALC-T5E0SZ

On what intervals is $f(x)=52+8x^3-x^4$ increasing?

A

$(-\infty, 6)$

B

$(-\infty,0), (6,\infty)$

C

$(-\infty,0), (0,6)$

D

$(6,\infty)$