## Encyclopedia > September 11, 2001 Terrorist Attack Casualties C

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# September 11, 2001 Terrorist Attack/Casualties C

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 Quadratic formula ... b/(2a), so we add the square of b/(2a) to both sides, getting $x^2+\frac{b}{a}x+\frac{b^2}{4a^2}=-\frac{c}{a}+\frac{b^2}{4a^2}.$ The left side ...