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2x=0 v(x²-1)=0 v (x²+4)=0
x=0 v x=1 v x=-1 x²=-4 sprzeczne
2x * (x + 1) * (x - 1) * (x² + 4) = 0
x = 0 lub x = -1 lub x = 1 (x² + 4 > 0)
Odp. To równanie ma 3 rozwiązania.