- #1

- 235

- 1

**Square root of -1.....**

We say that the square root of -1 is equal to i ( or j ), and that this is therefore not a real number - but what is this fact actually useful for? Why over complecate things with something not on the number line - why is it so useful to treat the square root of -1 as a number? :tongue2:

Thanks in advance.