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x do potegi 3 +xdo potegi 2 - 7x -7=0
x³+x²-7x-7=0
x²(x+1)-7(x+1)=0
(x+1)·(x²-7)=0
x+1=0
x=-1
x²-7=0
x²=7
x=√7 ∨ x=-√7
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x³+x²-7x-7=0
x²(x+1)-7(x+1)=0
(x+1)·(x²-7)=0
x+1=0
x=-1
x²-7=0
x²=7
x=√7 ∨ x=-√7