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If the coefficient of i is not zero then the number is not real.

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Q: How do you tell if a complex number isn't real?
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How do you tell a real number?

It has no imaginary part. A complex number is of the form a + bi where a and b are real numbers, and i = √-1. A real number has b = 0.


How can you tell which part of a complex number is the real part and which is the imaginary part?

The imaginary part is expressed as a product of i(square root of negative one), typically following a plus sign, so that the complex number has the form a + bi, with "a" the real part and "bi" the imaginary part.


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