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At What Value of X Does the Function $f ( x ) = x ^ { 3 } - 3 x ^ { 2 } - 9 x$

Question 173

Multiple Choice

At what value of x does the function $f ( x ) = x ^ { 3 } - 3 x ^ { 2 } - 9 x$ change from increasing to decreasing?

A) 3
B) 1
C) 4
D) - 3
E) 2
F) 0
G) - 2
H) - 1

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