Answer:
(5 -b)^4 = b^4 -20b^3 +150b^2 -500b +625
Step-by-step explanation:
The applicable rules of exponents are ...
√a = a^(1/2)
(a^b)^c = a^(bc)
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You have √((5-b)^8) = ((5 -b)^8)^(1/2)
= (5 -b)^(8/2) = (5 -b)^4
Sometimes, "simplify" means "remove parentheses".
(5 -b)^4 = b^4 -20b^3 +150b^2 -500b +625
