Originally Posted by

**Veronica1999** Which one of the following statements is not true for the equation ix(squared) - x + 2i =0 where i = root -1?

a. the sum of the roots is 2

b. the discriminant is 9

c. the roots are imaginary

d. the roots can be found by using the quadratic formula

e. the roots can be found by factoring, using imaginary numbers

I guessed the answer is a because the sum of the roots should be -1/i.

What is i? I don't understand the problem at all.

Does i stand for imaginary numbers?

When do I use imaginary numbers?