Work Step by Step
$7h^4-4h^3+28h^2-16h$ $=(7h^4+28h^2)-(4h^3+16h)$ $=7h^2(h^2+4)-4h(h^2+4)$ $=(h^2+4)(7h^2-4h)$ $=h(h^2+4)(7h-4)$
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