$\"\"$

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The equation is $\"\"$ .

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$\"\"$

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Substitute 0 for y.

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$\"\"$

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Add $\"\"$ to each side.

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$\"\"$

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$\"\"$

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Take square root of each side.

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$\"\"$

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Add 2 to each side.

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$

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The values of $\"\"$ .