i would like to know whether the focus of this equation of a parabola x²+2x+28y-111=0 is (-8,4) or (-1,3)?
(p.s. if it is first one my text book is wrong)
i would like to know whether the focus of this equation of a parabola x²+2x+28y-111=0 is (-8,4) or (-1,3)?
(p.s. if it is first one my text book is wrong)