Answer :
you use addition
exg
(2^2)^2 means (2 times 2) times (2 times 2) or (2*2*2*2) or 2^4
so just add exponents
exg
(2^2)^2 means (2 times 2) times (2 times 2) or (2*2*2*2) or 2^4
so just add exponents