Given the expression is of the form (−a)n(-a)^{n}(−a)n with a=8a = 8a=8 and n=2n = 2n=2.
Since n=2n = 2n=2 is even, the expression simplifies to an=8na^{n} = 8^{n}an=8n.
Given the expression is of the form −an-a^{n}−an with a=5a = 5a=5 and n=2n = 2n=2.
The expression simplifies to −an=−5n-a^{n} = -5^{n}−an=−5n.
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