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A complex number is an imaginary number and it is not real. It is expressed as a combination of a real part and an imaginary part as

a + i b where

1) a and b are real numbers (rational or irrational).

2) i = √-1 or i² = -1

The real number algebra is applied to complex numbers also. A real number cannot be equal to an imaginary number.

Examples are : 3 + 4 i , -2.6 + i √2

a + i b where

1) a and b are real numbers (rational or irrational).

2) i = √-1 or i² = -1

The real number algebra is applied to complex numbers also. A real number cannot be equal to an imaginary number.

Examples are : 3 + 4 i , -2.6 + i √2