How to find the real roots of f(x)=X^2 +1 Answer is x= +or- i but dont know how to get it

Question

I have all of the working out but i dont understand how the answer works as the roots are where the graph crosses the x axis but  f(x) = x^2 + 1 does not cross the x axis can someone please explain.

1.  x^2 + 1 =0

2.  x^2 = -1

3.  square root (x^2) = square root (-1)

4.  x = square root (-1)

5.  x = + or -  i

Answer 1

trick question.  There are no real roots to x^2 + 1