х^3-5х^2-2х+10=0
x^2(x-5)-2(x-5)=0
(x^2-2)(x-5)=0
x^2=2
x1=√2
x2=-√2
x-5=0
x3=5
x1*x2*x3=(√2)*(-√2)*5=(-2)*5= - 10
