[" Focus of parabola "y=ax^(2)+bx+c" is ...

[" Focus of parabola "y=ax^(2)+bx+c" is "],[[" 1) "((-b)/(2a),(b^(2)-4ac+1)/(4a))," 2) "((-b)/(2a),(4ac-b^(2)+1)/(4a))," 3) "((-b)/(2a),(b^(2)-4ac-)/(4a)]]

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