$\"\"$

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The quadratic equation is $\"\"$ .

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Consider $\"\"$ .

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Apply formula : $\"\"$ .

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$\"\"$

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Cancel common terms.

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$\"\"$

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Subtract 1 from each side.

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$\"\"$

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Divide each side by 2.

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$\"\"$ .

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$\"\"$

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The value of $\"\"$ .