Verified Answer :

\(8^{-10}\) can be converted into \(\frac{1}{ 8^{10} }\) , and applying this to \(8^{-5}\) can see that

\(\frac{ \frac{1}{ 8^{10} } }{ \frac{1}{ 8^{5} } }\)

This gives us 

\(\frac{ 8^{5} }{ 8^{10} } = \frac{1}{ 8^{5} } = 8^{-5}\)

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