\"\"

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The expression is \"\".

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\"\"                   (Substitute x = 49)

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

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

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\"\"                         (The positive square root of 49 is 7)

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\"\"                           (Multiply: \"\")      \"\"

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The value of expression is 28.