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Factor -4d^3 + 28d^2 - 4d

User Strayer
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$\begin{align} -4d^3+28d^2-4d&=(-4d* d^2)+(-4d*-7d)+(-4d* 1)\\&=\boxed{-4d(d^2-7d+1)} \end
User Darvex
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