## Encyclopedia > May 13

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# May 13

May 13 is the 133rd day of the year in the Gregorian calendar (134th in leap years). There are 232 days remaining.

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 Quadratic formula ... our quadratic equation by a, we have $x^2 + \left( \frac{b}{a} \right) x + \frac{c}{a}=0$ which is equivalen ...