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# Square root

Any positive number, such has 9, has two square roots. Three can be multiplied by itself to yield nine, but so can negative three, because the negatives signs cancel out to yield positive 9. Any negative number has no square root, because no number multiplied by itself can be a negative number. The square root of a negative number, as the solution to an equation such as ${\displaystyle x^{2}=-3}$, is sometimes represented by ${\displaystyle i}$, imaginary.