1. The problem statement, all variables and given/known data Write the equation in standard form for the parabola with an axis of symmetry y=0 and focus(-5,0). 2. Relevant equations I think ax^2+bx+c. Also maybe x = -b/2a. But I don't know how to apply these. 3. The attempt at a solution I know that focus and vertex lie on axis of symmetry and that directrix ane axis of symmetry are perpendicular to each other. If you could give me a similar example worked out, I would be able to do this one. Thanks.