Question

х^3+7х^2-6=0 решите

Answer 1

x^3+x^2+6x^2+6x-6x-6

x^2*(x+1)+6x*(x+1)-6(x+1)=0

(x+1)*(x^2+6x-6)=0

x+1=0   и x^2+6x-6

x=-1    x=-3+sqrt(15)    x=-3-sqrt(15)