$$3(a+2)^{2}+(a+4)^{2}$$
$4\left(a^{2}+5a+7\right)$
$$3\left(a^{2}+4a+4\right)+\left(a+4\right)^{2}$$
$$3a^{2}+12a+12+\left(a+4\right)^{2}$$
$$3a^{2}+12a+12+a^{2}+8a+16$$
$$4a^{2}+12a+12+8a+16$$
$$4a^{2}+20a+12+16$$
$$4a^{2}+20a+28$$
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$4a^{2}+20a+28$
