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Δ=49-24=25 x1=[7-5]/2=1 x2=[7+5]/2=6
W(x) = 5x^3 + x^2 - 20x - 4=x^2(5x+1)-4(5x+1)=(x^2-4)(5x+1)=(x+2)(x- 2) (5x+1)
x^3 - x do potęgi trzeciej