# Complex Numbers A complex number is a number in the form `a + b * i` where `a` and `b` are real and `i` satisfies `i^2 = -1`. Assume the programming language you are using does not have an implementation of complex numbers. ## Source Wikipedia [https://en.wikipedia.org/wiki/Complex_number](https://en.wikipedia.org/wiki/Complex_number) ## Submitting Incomplete Solutions It's possible to submit an incomplete solution so you can see how others have completed the exercise.