(x - 1)(x + 1)(x² + 7x)(x - 4) - 2 = 2x(x - 1)(x + 1)(x² + 7x)(x - 4) - 2 - 2x = 0(x - 1)(x + 1)(x² + 7x)(x - 4) - 2(1 + x) = 0(x + 1)((x - 1)(x² + 7x)(x - 4) - 2) = 0x1 = -1(x - 1)(x² + 7x)(x - 4) - 2 = 0(x² - 5x + 4)(x² + 7x) - 2 = 0 x^4 + 7x³ - 5x³ - 35x² + 4x² + 28x - 2 = 0x^4 + 2x³ - 31x² + 28x - 2 = 0x2 ≈ 0,0718x3 ≈ 0,9616
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