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Use the Derivative Of f(x)=3x3+9xf ( x ) = 3 x ^ { 3 } + 9 x

Question 4

Multiple Choice

Use the derivative of f(x) =3x3+9xf ( x ) = 3 x ^ { 3 } + 9 x to determine any points on the graph of f(x) f ( x ) a which the tangent line is horizontal.


A) (1,12) ( 1,12 )
B) (1,12) ( 1,12 ) and (1,12) ( - 1 , - 12 )
C) (3,108) ( 3,108 ) and (3,108) ( - 3,108 )
D) (0,0) ( 0,0 )
E) f(x) f ( x ) has no points with a horizontal tangent line.

Correct Answer:

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