Answer
$q^{2}(3q-10)(3q-4)$
Work Step by Step
$9q^{4}-42q^{3}+49q^{2}=q^{2}(9q^{2}-42q+40)$
$9q^{2}-42q+40=(3q-10)(3q-4)$
$q^{2}(3q-10)(3q-4)$
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