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

The focus of the parabola y=2x^(2)+x is

The focus of the parabola y^2= 4ax is :

The focus of the parabola y=2 x^(2)+x is

The line passing through the focus S of the parabola y=ax^(2)+bx+c meets the parabola at P and Q such that SP=4 and SQ=6 .Then length of the latusrectum is

If the line passing through the focus S of the parabola y=ax^(2)+bx+c meets the parabola at P and Q and if SP=4 and SQ=6, then find the value of a.

The vertex or the parabola y = ax^(2)+bx+c is

The focus of the parabola y^(2) = - 4ax is :

A circle, with its centre at the focus of the parabola y^2 =4ax and touching its directrix, intersects the parabola at the point (A) (a, 2a) (B) (a,-2a) (C) (a/2, a) (D) (a/2, 2a)