How do you find the Directrix?

Related questions

1. How do you find the equation of the top half of a circle?
2. Can a circle be a function?
3. What is the equation of a circle if the center is 0 0?
4. Why is 3.14 called pi?
5. Why is Pi used in circle formula?
6. How do you find radius from circumference?
7. How are parabolas formed?
8. What is the general equation for conic sections?
9. What are the four types of conics?
10. What is the formula for a parabola?

Tags

1. #standard
2. #parallel
3. #symmetry
4. #equation
5. #focus
6. #vertex
7. #directrix
8. #where
9. #rotated
10. #parabola