$\"\"$

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The equation is $\"\"$ .

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$\"\"$ (Write original equation)

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$\"\"$ (Substitute y for 0)

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$\"\"$ (Add 1 to each side) $\"\"$

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$\"\"$ (Take square root of each side)

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$\"\"$ (Add 4 to each side)

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$\"\"$

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$\"\"$ $\"\"$

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The values of $\"\"$ .