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x^3+27=x^3-9x+x^2-9
x^3-x^3-x^2=-9-27
-x^2=-36/ : ( -1)
x^2=36/ dzielone przez pierwiastek
x=6
b) (x^2+5)(x^2-5)=x^2(x^2-1)
x^4-5x^2+5x^2-25=x^4-X^2
x^2=25/ przez pierwiastek
x=5