Hi Seth,
(9p)2 (3p4)6
92 p2 36 p24
= 81 p2 729 p24
= 59049 p26
When we have one base (p) with multiple exponents (i.e. (p4)6), we multiply the exponents.
When we have two or more of the same base, being multiplied, each raised to its own power, we add the exponents.