Question: how to solve quadratic equation in complex numbers?
Answer: Given a quadratic equation in standard form (y = ax^2 + bx + c), the discriminant is b^2 - 4ac. If the discriminant is positive, you'll get two real answers. If it's equal to zero, you're only going to get one real answer. But if the discriminant is negative, that's when you get two complex solutions to your problem.