\"\"

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The expression is \"\".

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Method 1:-

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\"\"

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For any real number b and for any positive integer n, \"\".

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\"\"

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\"\"                           (Rewrite: \"\")

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\"\"

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\"\"

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\"\"

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\"\"

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\"\"

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Method 2:-

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\"\"    (Rewrite: \"\")

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\"\"                        (Apply Power of a power property: \"\")

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\"\"                       (Rewrite: \"\")

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\"\"

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\"\"

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The rational exponent of \"\" is 2.