$$\left. \begin{array} { l } { 4 x ^ { 4 } + 81 } \\ { a ^ { 4 } + 2 a ^ { 2 } + 9 } \end{array} \right.$$
$\left(4x^{4}+81\right)\left(a^{4}+2a^{2}+9\right)$
$$4x^{4}+81=\left(2x^{2}-6x+9\right)\left(2x^{2}+6x+9\right)$$ $$a^{4}+2a^{2}+9=\left(a^{2}-2a+3\right)\left(a^{2}+2a+3\right)$$
$$\left(4x^{4}+81\right)\left(a^{4}+2a^{2}+9\right)$$
$$4a^{4}x^{4}+8a^{2}x^{4}+36x^{4}+81a^{4}+162a^{2}+729$$
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$4x^{4}+81,\ a^{4}+2a^{2}+9$
