f(x)=x^3+10x^2+7x-18
f(1)=1^3+10*1^2+7*1-18=0
(x^3+10x^2+7x-18):(x-1)=x^2+11x+18 x^2+11x+18=0
-(x^3-x^2) x^2+11x=-18
----------- (x+5,5)^2=-18+5,5^2=12,25
11x^2+7x x₂ =-5,5+\( \sqrt{12,25} \)=-2
x₃= -5,5-\( \sqrt{12,25} \)=-9
-(11x^2-11x)
----------------------
18x-18
-(18x-18)
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0