A combination of a real and an imaginary number in the form a + bi
a and b are real numbers, and
i is the "unit imaginary number" √(−1)
The values a and b can be zero.
These are all complex numbers:
• 1 + i
• 2 − 6i
• −5.2i (an imaginary number is a complex number with a=0)
• 4 (a real number is a complex number with b=0)
See: Imaginary Number