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6 January, 11:30

X-squared plus twenty-five equals zero

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  1. 6 January, 12:11
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    Subtract 25 from each side of that equation, and it says that x-squared = negative 25. 'X' can't be any real number. If you know how to work with imaginary numbers, you'll know that the two solutions are x=5i and x=-5i ... the ' i ' is the symbol meaning the square root of - 1.
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