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The concept of imaginary numbers was created to solve equations that can't be solved in one system. There is no number that can be multiplied by itself to yield a negative result, leading to the creation of the imaginary unit i. Hero of Alexandria pretended there was a square root of negative one, which we now call i. Ren Descartes called i imaginary to insult it, but it became a useful tool in mathematics. Imaginary numbers are used as a cheat code to solve equations in another system. Square root of negative 25 is simply i.