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What is imaginary numbers?

a negative numbers

a numbers which, after multiplying, give a negative result

a numbers that, when squared, has a negative result

all numbers which are not rational numbers

Essentially, an imaginary number is the square root of a negative number and does not have a tangible value. While it is not a real number — that is, it cannot be quantified on the number line - imaginary numbers are "real" in the sense that they exist and are used in math. Imaginary numbers are particularly applicable in electronics.

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