$\"\"$

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The expression is $\"\"$ .

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Write the expression in quadratic form.

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$\"\"$ (Original expression)

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$\"\"$ (Rewrite the expression)

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$\"\"$ (Write the quadratic form)

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$\"\"$ (Difference of squares)

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$\"\"$ (Difference of cubes)

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$\"\"$ (Simplify)

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$\"\"$ . $\"\"$

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The quadratic expression is $\"\"$ .