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A complex number is a number that can be expressed in the form a + bi, where a and b are real numbers, and i is a solution of the equation x2 = −1. Because no real number satisfies this equation, i is called an imaginary number.

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TheBlueFox

A complex number is a number that can be written in the form a + bi,

where a and b are real numbers not equal to zero.

For example, 1 + 2i is a complex number.

Another example would be -5 - i √7.

Another way to think about complex numbers is that a complex number

is just the sum or difference of a real number and an imaginary number.

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