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x = -b plus or minus the square root of (b^2 - 4ac) all divided by 2a. Used for quadratic equations where you can't factor. the equ..
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sco·to·phil·i·a (skt-fl-)noun: a preference for the night, and or darkness.
also called: nyctophilia nyc·to·phil·i·a (nkt-fl-)
scotoph..