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(x²)²- 3(x²) - 4 + 2x³- 8x = 0
(x²- 4) (x² + 1) + x( 2x² - 8) =0
Multiplicando a ambos lados de la ecuación por 1/2:
(x²- 4) (x² + 1)/2 + x( 2x² - 8)/2 =0
(x²- 4) (x²/2 + 1/2) + x( x² - 4) =0
(x²-4) (x²/2 + 1/2 + x) = 0
Multiplicando a ambos lados por 2
(x²-4) (x² + 2x + 1) = 0
(x²-4) (x + 1)² = 0
(x+1)² = 0
x= -1
x² -4= 0
√x² = √4
x=2, -2
R: x= -2, -1, 2