$\"\"$

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The given expression is $\"\"$ .

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$\"\"$ (Square on each side)

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$\"\"$ \ \

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$\"\"$ (Cancel square and root)

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$\"\"$ ( $\"\"$ )

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

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$\"\"$ (Subtract 7 from each side)

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$\"\"$ (Apply additive inverse propetry: $\"\"$ )

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$\"\"$ (Apply additive identity property: $\"\"$ )

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$\"\"$ (Subtract: $\"\"$ ) \ \ $\"\"$

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The equation $\"\"$ , on substitute $\"\"$ .

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$\"\"$

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

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$\"\"$ (Square on each side)

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$\"\"$ \ \

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$\"\"$ (Cancel square and root) \ \

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

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The check solution is true at $\"\"$ . $\"\"$

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The solution is $\"\"$ .