What Is the Length of the Largest Interval on Which $f ( x ) = x ^ { 3 } - 3 x ^ { 2 } - 9 x$

question 191

Multiple Choice

What is the length of the largest interval on which the function $f ( x ) = x ^ { 3 } - 3 x ^ { 2 } - 9 x$ is decreasing?

• A) \(3 \sqrt { 2 }\)
• B)1
• C)4
• D) \(2 \sqrt { 2 }\)
• E)3
• F)
• \(2 \sqrt { 3 }\)
• G) \(\sqrt { 3 }\)
• H)2

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