Question 669567


first find  roots:

{{{x^2+1=0}}}

{{{x^2=-1}}}

{{{x=sqrt(-1)}}}

roots:

{{{x=i}}} and {{{x=-i}}}

the sum of the roots: {{{i+(-i)=i-i=0}}}

the product of the roots: {{{i(-i)=-i^2=-(-1)=1}}}