$$16 { \left(x+y \right) }^{ 2 } -25 { \left(x-y \right) }^{ 2 }$$
$\left(9x-y\right)\left(9y-x\right)$
$$16\left(x^{2}+2xy+y^{2}\right)-25\left(x-y\right)^{2}$$
$$16x^{2}+32xy+16y^{2}-25\left(x-y\right)^{2}$$
$$16x^{2}+32xy+16y^{2}-25\left(x^{2}-2xy+y^{2}\right)$$
$$16x^{2}+32xy+16y^{2}-25x^{2}+50xy-25y^{2}$$
$$-9x^{2}+32xy+16y^{2}+50xy-25y^{2}$$
$$-9x^{2}+82xy+16y^{2}-25y^{2}$$
$$-9x^{2}+82xy-9y^{2}$$
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$-9x^{2}+82xy-9y^{2}$
