Question

x4 + 2x3 - 6x - 12 = 0

daję naj.

Answer 1

x4 + 2x3 - 6x - 12 = 0

x³(x + 2) - 6(x + 2) = 0

(x + 2)(x³ - 6) = 0

x + 2 = 0    lub    x³ - 6 = 0

x = -2                   x³ = 6

                             x = ∛6   lub   x = -∛6

odp. x = -2  lub  x = ∛6   lub   x = -∛6