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?