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x³ - 2x² - 4x² + 8x +4x -8 ≥0
x²(x-2) -4x(x-2) +4(x-2) ≥ 0
(x²-4x+4)(x-2) ≥ 0
(x-2)²(x-2) ≥ 0
(x-2)³ ≥ 0
x-2 ≥ 0
x ≥ 2
x³ - 6x² + 12x - 8 ≥ 0
Wg wzoru skróconego mnożenia na sześcian sumy (a+b)³:
(x-2)³ ≥ 0
x - 2 ≥ 0
x ≥ 2
x3 - 2x2 - 4x2 + 8x +4x -8wieksze badz rowne 0
x2(x-2) -4x(x-2) +4(x-2)wieksze badz rowne 0
(x2-4x+4)(x-2)wieksze badz rowne 0
(x-2)kwadrat(x-2)wieksze badz rowne 0
(x-2)do trzeciej wieksze badz rowne 0
odp:
x-2 wieksze badz rowne 0
x wieksze badz rowne 2
prosze ;))