$$4 { y }^{ 2 } -25 { x }^{ 2 }$$
$\left(2y-5x\right)\left(5x+2y\right)$
$$\left(2y-5x\right)\left(2y+5x\right)$$
$$\left(-5x+2y\right)\left(5x+2y\right)$$
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$4y^{2}-25x^{2}$
