$${ \left(4x \right) }^{ 2 } - { \left(9y \right) }^{ 2 }$$
$16x^{2}-81y^{2}$
$$4^{2}x^{2}-\left(9y\right)^{2}$$
$$16x^{2}-\left(9y\right)^{2}$$
$$16x^{2}-9^{2}y^{2}$$
$$16x^{2}-81y^{2}$$
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