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n(2) +5n + 4 =0
Aplicas fórmula bicuadradas:
n = - 5 +- √ 25 -16 / 2
n= -5 +- √9 /2
n1 = -5 + 3 /2
n1= -2/2
n1= -1
n2= -5-3 /2
n2= -8/2
n2= -4
Espero te sirva de ayuda.