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[x - (2 - 3 i)] [x - (- 2 + 3 i)]
Si quitamos los paréntesis:
P(x) = x² + 5 + 21 i
Para que el polinomio sea real los complejos deben ser conjugados, tal como:
[x - (2 + 3 i)] [x - (2 - 3 i)] = x² - 4 x + 13
Saludos Herminio