Encyclopedia > February 21

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February 21

February 21 is the 52nd day of the year in the Gregorian Calendar. There are 313 days remaining, 314 in leap years.

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See Also: January, February, March, April, May, June, July, August, September, October, November, December

February 20 - February 22 - January 21 - March 21 - more historical anniversaries



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Quadratic formula

... make it a perfect square trinomial of the form x2 + 2xy + y2. Since "2xy" in this case is (b/a)x, we must have y = b/(2a), so we add the square of b/(2a) to both sides, ...

 
 
 
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