Use the Derivative Of $f ( x ) = 5 x ^ { 3 } + 15 x$

question 113

Multiple Choice

Use the derivative of $f ( x ) = 5 x ^ { 3 } + 15 x$ to determine any points on the graph of $f ( x )$ at which the tangent line is horizontal.

• A) \(( 1,20 )\)
• B) \(( 1,20 )\) and \(( - 1 , - 20 )\)
• C) \(( 5,700 )\) and \(( - 5,700 )\)
• D) \(( 0,0 )\)
• E) \(f ( x )\) has no points with a horizontal tangent line.

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