x³+3x²-5x-15=0
x²(x+3)-5(x+3)=0
(x+3)(x²-5)=0
(x+3)(x+√5)(x-√5)=0
x=-3 lub x=-√5 lub x=√5
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x³+3x²-5x-15=0
x²(x+3)-5(x+3)=0
(x+3)(x²-5)=0
(x+3)(x+√5)(x-√5)=0
x=-3 lub x=-√5 lub x=√5