1.

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

Answer»

`((-b)/(2a).(b^(2)-4ac+1)/(4A))`
`((-b)/(2a).(4ac-b^(2)+1)/(4a))`
`((-b)/(2a).(b^(2)-4ac-1)/(4a))`
`((b)/(2a).(b^(2)-4ac+1)/(4a))`

Answer :B


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