Encyclopedia > September 21

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September 21

September 21 is the 264th day of the year (265th in leap years). There are 101 days remaining.

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September 20 · September 22 · August 21 · October 21 · more historical anniversaries

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



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Quadratic formula

... complete the square[?]. To "complete the square" is to add a constant (i.e., in this case, a quantity that does not depend on x) to the expression to the left of "=", ...

 
 
 
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