Which of the following is the tangent line to the curve at the point
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Since f ′ ( x ) = 6 x 2 − 1 6 x and f ′ ( 1 ) = − 1 0 , the equation of the tangent line is y + 6 = − 1 0 ( x − 1 ) or y + 1 0 x = 4 .