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czyli x = -5, x = 3, x =4
b) 2xdo potęgi 5 -5x do potęgi czwartej -3x³=0
x³(2x² - 5x +3) =0
x = 0 lub 2x² - 5x +3 =0
delta = 1
pierwiastek z delty = 1
x1 =1
x2= 1,5
c) x³ - 2x² +4x- 8 =0
x² (x - 2) +4(x -2) = 0
(x² + 4) (x -2) = 0
x = 2
d) 3x³ - 3x² + 4x - 4 = 0
3x²(x -1) +4(x-1) = 0
(3x² + 4) (x -1) = 0
x = 1