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p3 - pierw. kw. z 3
P(x) =x^4 - 9 =(x^2 -3)*(x^2 +3) =(x^2 +3)*(x-p3)*(x+p3)
Wspólny pierwiastek W(x) i P(x) , to x =p3.
x^2 +4 > 0 oraz x^2 + 3 > 0.