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In solutions to quadratic equations, and higher order equations, it is usual, in most cases, to have more than one solution. A solution such as the square root of minus one is said to be imaginary as there are no real numbers that can be squared that give you the result of minus one. There is a branch of mathematics called complex numbers that you would need to study to understand in depth but it is a useful tool for representing and performing calculations in heavy electrics (amongst other things) where equipment may be powered by three phase currents.

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