Main content
Course: Get ready for Precalculus > Unit 7
Lesson 4: Focus and directrix of a parabolaEquation of a parabola from focus & directrix
You might need: Calculator
If you're seeing this message, it means we're having trouble loading external resources on our website.
If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.