Determining Concavity

AP Calculus AB· difficulty 2/5

f(x) = x^3 - 6x^2 + 9x

A
$(-\infty, 1)$
B
$(1, 3)$
C
$(-\infty, 2)$
D
$(2, \infty)$
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Explanation

f''(x) = 6x - 12 > 0 \Leftrightarrow x > 2

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