\"\"

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The expression is \"\".

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Square Root of a Number: If b2 =a, then b is a square root of a.

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\"\"                               (Substitute  x = 9)

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\"\"                              (Rewrite the \"\")

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\"\"                                   (The positive square root of 9 is 3)

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\"\"                                         (Add: \"\")\"\"

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The value of expression is \"\".