Answer
$$4\left(5x+7\right)\left(5x-14\right)$$
Work Step by Step
Factoring the expression completely, we find:
$$ 100x^2-140x-392 \\ 4\left(25x^2-35x-98\right) \\ 4\left(5x+7\right)\left(5x-14\right)$$
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