What+is+a+Complex+Number?

=What is a Complex Number?= A complex number is a number that consists of a real part and an imaginary part. (Imaginary numbers are usually written as i or j and exist as the square root of negative numbers.) For example: 5+3i is a complex number because 5 is a real number and 3i is an imaginary number. You could also argue that 6 is a complex number because it is really 6 + 0//i//. Therefore, every Rational and Imaginary number is technically complex.

Mr Gill says: but what is 'i'?

i is the sqrt of -1. This is so mathematicians could get a solution for x 2 =-1.