$$(7a^{2}+8b^{2})(2a^{2}b-5ab^{2})$$
$ab\left(2a-5b\right)\left(7a^{2}+8b^{2}\right)$
$16a^{2}b^{3}-40ab^{4}-35b^{2}a^{3}+14ba^{4}$
