Example 9 Find the truth set of P(x) : x EC^x² + 3x + 4 = 0. Solution: x² + 3x + 4 = 0 -3±√-7 X = 2 {x € C | x² + 3x + 4 = 0} = {−³+¹√², -3-√²} (1 = √−1). 2 2

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