$\"\"$

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The expression is $\"\"$ .

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$\"\"$

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$\"\"$ (Apply formula: $\"\"$ )

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$\"\"$ (Take out common factors)

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$\"\"$

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$\"\"$

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Exclude the values for which $\"\"$ , and the denominator cannot equal 0. $\"\"$

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$\"\"$

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Apply zero product property: $\"\"$ then $\"\"$

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$\"\"$

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$\"\"$

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Apply subtraction property of equality: If a = b then $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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Apply addition property of equality: If a = b then $\"\"$ .

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$\"\"$

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$\"\"$

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Then the value of n not equal $\"\"$ . $\"\"$

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The value of n not equal $\"\"$ .