High Quality Content by WIKIPEDIA articles! In mathematics, a quadratic irrational, also known as a quadratic irrationality or quadratic surd, is an irrational number that is the solution to some quadratic equation with rational coefficients.Since fractions can be cleared from a quadratic equation by multiplying both sides by their common denominator, this is the same as saying it is an irrational root of some quadratic equation whose coefficients are integers.
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