$\"\"$

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The equation is $\"\"$ .

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$\"\"$ is not a perfect square.

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Subtract 12 from each side.

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$\"\"$

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

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Add 9 to each side.

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$\"\"$

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Factor the perfect square trinomial.

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$\"\"$

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$\"\"$

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Take square root on each side.

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$\"\"$

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$\"\"$ (i²= -1) $\"\"$

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Add 3 to each side.

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$\"\"$

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$\"\"$

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$\"\"$

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The solution set is $\"\"$ .