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$\"\"$

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The function is $\"\"$ .

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$\"\"$ (Write original function)

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

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$\"\"$ (Simplify) $\"\"$

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The solution $\"\"$ .

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$\"\"$

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The function is $\"\"$ .

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$\"\"$ (Write original function)

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$\"\"$ (Substitute $\"\"$ )

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$\"\"$ (Cancel common terms)

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$\"\"$ (Simplify) $\"\"$

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The solution $\"\"$ .