4 ^ - 5 All square divided by 8 ^ - 6
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Answer:2^28
4^-5/8^-6
8^-6=((2)^3)^-6 (am)^n=a^n x m^n
2^3 x-6 (a^m)^n =a^mn
2^ -18
in the same way 4^-5=2^-10
so now,
2^-10/2^-18 a^m/a^n =a^-n
2^-10- (-18)
2^10+18
2^28
hope it helps
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