Use the derivative of $f ( x ) = 3 x ^ { 4 } + 4 x ^ { 3 }$ to determine any points on the graph of $f ( x )$ at which the tangent line is horizontal.
A) $( 1,7 )$ and $( - 1 , - 1 )$
B) $( - 1 , - 12 )$
C) $f ( x )$ has no points with a horizontal tangent line.
D) $( 0,0 )$ and $( - 1 , - 1 )$
E) $( 3,0 )$

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The Answer of Use the derivative of $f ( x ) = 3 x ^ { 4 } + 4 x ^ { 3 }$ to determine any points on the graph of $f ( x )$ at which the tangent line is horizontal.
A) $( 1,7 )$ and $( - 1 , - 1 )$
B) $( - 1 , - 12 )$
C) $f ( x )$ has no points with a horizontal tangent line.
D) $( 0,0 )$ and $( - 1 , - 1 )$
E) $( 3,0 )$

Use the Derivative Of f(x)=3x4+4x3f ( x ) = 3 x ^ { 4 } + 4 x ^ { 3 }f(x)=3x4+4x3

Use the Derivative Of $f ( x ) = 3 x ^ { 4 } + 4 x ^ { 3 }$