An Equation for the Tangent Line to the Curve $f ( x ) = x ^ { 3 } ( 1 - 3 x ) ^ { 2 }$

An equation for the tangent line to the curve $f ( x ) = x ^ { 3 } ( 1 - 3 x ) ^ { 2 }$ at the point where x = -1 is y = 72x + 56.