$$9 { x }^{ 2 } - { \left( { x }^{ 2 } -4 \right) }^{ 2 }$$
$-x^{4}+17x^{2}-16$
$$9x^{2}-\left(\left(x^{2}\right)^{2}-8x^{2}+16\right)$$
$$9x^{2}-\left(x^{4}-8x^{2}+16\right)$$
$$9x^{2}-x^{4}+8x^{2}-16$$
$$17x^{2}-x^{4}-16$$
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