$$25b^{2}x-b^{2}xy^{2}$$
$-x\left(y-5\right)\left(y+5\right)b^{2}$
$$b^{2}x\left(25-y^{2}\right)$$
$$\left(5-y\right)\left(5+y\right)$$
$$\left(-y+5\right)\left(y+5\right)$$
$$b^{2}x\left(-y+5\right)\left(y+5\right)$$
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$-xb^{2}\left(y^{2}-25\right)$