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Light second

A light second is the distance light travels in one second: 299,792.458 km

See also: speed of light, light year.



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Quadratic formula

... 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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