$$a a ^ { 4 } + 84 a ^ { 2 } + 252$$
$a\left(5a^{3}+168\right)$
$$4aa^{4-1}+2\times 84a^{2-1}$$
$$4aa^{3}+2\times 84a^{2-1}$$
$$4aa^{3}+168a^{2-1}$$
$$4aa^{3}+168a^{1}$$
$$4aa^{3}+168a$$
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$a^{5}+84a^{2}+252$
$$a^{5}+84a^{2}+252$$
