Find all points on the graph of the function $f ( x ) = x ^ { 3 } ( 5 x + 20 )$ where the tangent line is horizontal.

Name: Find all points on the graph of the function $f ( x ) = x ^ { 3 } ( 5 x + 20 )$ where the tangent line is horizontal.
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The Answer of Find all points on the graph of the function $f ( x ) = x ^ { 3 } ( 5 x + 20 )$ where the tangent line is horizontal.

Find All Points on the Graph of the Function f(x)=x3(5x+20)f ( x ) = x ^ { 3 } ( 5 x + 20 )f(x)=x3(5x+20)

Find All Points on the Graph of the Function $f ( x ) = x ^ { 3 } ( 5 x + 20 )$