$${ \left(9x \right) }^{ 2 } - { \left(9x \right) }^{ 2 }$$
$0$
$$9^{2}x^{2}-\left(9x\right)^{2}$$
$$81x^{2}-\left(9x\right)^{2}$$
$$81x^{2}-9^{2}x^{2}$$
$$81x^{2}-81x^{2}$$
$$0$$
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$$81\left(x^{2}-x^{2}\right)$$
