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Usamos el teorema del resto:
R = P(-2) = k (-2)³ + (-2)² + k² (-2) + 11
R = - 2 k² - 8 k + 15 = 0
Ecuación de segundo grado en k, que resuelvo directamente.
k = √46/2 - 2;
k = - √46/2 - 2
Saludos Herminio