Question 1057116
<a href="https://www.youtube.com/watch?v=M8LGsQMwwj4">Derive equation of a parabola according to definition, given focus and directrix</a>


<a href="https://www.youtube.com/watch?v=Wworlx39KfQ">Derive equation of a parabola according to definition - orientation different, vertex not at origin</a>