$$16 x ^ { 6 } - 16 x ^ { 5 } + 4 x ^ { 4 } \quad 18$$
$8\left(2x^{2}-2x+9\right)x^{4}$
$$8\left(2x^{6}-2x^{5}+9x^{4}\right)$$
$$x^{4}\left(2x^{2}-2x+9\right)$$
$$8x^{4}\left(2x^{2}-2x+9\right)$$
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$$16x^{6}-16x^{5}+72x^{4}$$
