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x^4+x^3+2x^2+4x-8=0
1)Factorización:
(x^2+4)(x-1)(x+2)=0
x^2+4=0
x^2=-4
x=+/-√4
x=2i ; -2i
(x-1)=0
x=1
(x+2)=0
x=-2
Solución:
x= [2i ;-2i ;1 ; -2]