$$2 a b ^ { 2 } + 3 a ^ { 2 } b + 7 b ^ { 2 } a + 9 a ^ { 2 } c$$
$3a\left(ab+3ac+3b^{2}\right)$
$$a\left(2b^{2}+3ab+7b^{2}+9ac\right)$$
$$3ab+9ac+9b^{2}$$
$$3\left(ab+3ac+3b^{2}\right)$$
$$3a\left(ab+3ac+3b^{2}\right)$$
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