How did imaginary numbers come into existence? What was the first problem that required use of imaginary number?

Question

How did imaginary numbers come into existence? What was the first problem that required use of imaginary number?

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Answer 1

An imaginary number is just the square root of a negative number. When people were first doing square roots they would they would have realized they existed but just ignored them. It’s worth mentioning that applying problems to the real world you ignore any imaginary parts of the answer.