Question 1045849
The question deals with the definition of a parabola.  Study these and they should help very much.


<a href="https://www.youtube.com/watch?v=M8LGsQMwwj4">derive equation for parabola, vertex at origin</a>
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<a href="https://www.youtube.com/watch?v=Wworlx39KfQ">similar, different orientation, vertex not at origin</a>