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x³+4x²-2x-8=0
x²(x+4)-2(x+4) = 0
(x²-2) (x+4) = 0
(x²-2) = 0 (x+4) = 0
x² = 2 x = -4
x=√2
x³+4x²-2x-8=0
x²(x+4)-2(x+4) = 0
(x²-2) (x+4) = 0
(x²-2) = 0 (x+4) = 0
x² = 2 x = -4
x=√2 lub x = -√2 x = -4