When there's a whole power of powers, they gets multiplied, then
= (16¼ a^8*¼ b^4*¼)
Now we can write 16 = 2^4, then
= (2^4*¼ a^8*¼ b^4*¼)
= (2 a^2 b)
(16a^8 b^4)¼ = (2 a^2 b)
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