Question

Find the directrix of the parabola y = 1∕8(x – 2)^2 – 3.Question options:A) y = –3B) y = –1C) y = –5D) y = 2

Answer 1

In general, the vertex form of a quadratic equation is

$\begin{gathered} y=a(x-h)^2+k \\ (h,k)\to\text{vertex} \end{gathered}$

On the other hand, the directrix is a vertical line that