$${ \left(3 { a }^{ 5 } { b }^{ 7 } \right) }^{ 4 }$$
$81a^{20}b^{28}$
$$\left(3a^{5}b^{7}\right)^{4}$$
$$3^{4}\left(a^{5}\right)^{4}\left(b^{7}\right)^{4}$$
$$81\left(a^{5}\right)^{4}\left(b^{7}\right)^{4}$$
$$81a^{5\times 4}b^{7\times 4}$$
$$81a^{20}b^{7\times 4}$$
$$81a^{20}b^{28}$$
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