A combination of a real and an imaginary number in the form

The values

These are all complex numbers:

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•

•

•

**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:

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**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

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