$$(a+b)^{2}+16b^{2}$$
$a^{2}+2ab+17b^{2}$
$$a^{2}+2ab+b^{2}+16b^{2}$$
$$a^{2}+2ab+17b^{2}$$
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$\left(a+b\right)^{2}+16b^{2}$
