$\"\"$

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The equation is $\"\"$ . \ \ $\"\"$ (Square each side and eliminate the square roots)

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$\"\"$ (Evaluate power: $\"\"$ )

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$\"\"$ (Subtract 18 from each side) \ \

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$\"\"$

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Apply division property of equality: a = b, then $\"\"$ .

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$\"\"$ (Divide each side by 7)

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$\"\"$ (Cancel common terms)

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$\"\"$ (Divide: $\"\"$ ) $\"\"$

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Check:

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To check the solution substitute $\"\"$ in $\"\"$ .

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$\"\"$

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

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

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$\"\"$ (Evaluate square roots: $\"\"$ ) \ \ The solution is "True". $\"\"$

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The solution is "True".