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Factor común x^4 entre los dos primeros:
x^4 (2 x - 3) - 2 x + 3 = x^4 (2x - 3) - (2 x - 3) = (x^4 - 1) (2 x - 3)=
(x^2 + 1) (x + 1) (x - 1) (2 x - 3) = 0
Hacemos cada factor sucesivamente nulo
x^2 + 1= 0; raíces: x = i; x = - i
x + 1 = 0: x = - 1
x - 1 = 0; x = 1
2 x - 3 = 0; x = 3/2
Hay en total 5 raíces.
Saludos Herminio