Odpowiedzi

2010-03-23T21:24:07+01:00
X³+5x²-9x-45=0
x²(x+5)-9(x+5)=0
(x+5)(x²-9)=0
(x-3)(x+3)(x+5)=0
x-3=0v x+3=0v x+5=0
x=3v x=-3vx=-5