Focus and Directrix of a Parabola
Read this topicExplanations 3
- (Videos) Directrix and Focus by PatrickJMT Here's a video by patrickJMT showing you how to find the focus and directrix of a parabola. Below are some more examples by him if you…
By Alex Federspiel, Anusha Rahman
- ###Focus and Directrix‾\underline{\textbf{Focus and Directrix}}Focus and Directrix One important quality that defines a parabola is the fact that all points that line along it …
By Mia, Anusha Rahman
- Parabola: Focus and Directrix A parabola is a curved shape that looks like a U. It can open up, down, left, or right. Every parabola has a point called the focus and a line call…
By Anusha Rahman
Problems 7
- A parabola has directrix y=2y = 2y=2 and crosses through the points (2,3)(2, 3)(2,3) and (5,5)(5, 5)(5,5). How many points could possibly be the focus of this parabola?
- A parabola has focus (1,1)(1,1)(1,1) and directrix y=−1y = -1y=−1. What is the equation of this parabola?
- What is the focus point of the parabola y=x2+4x−10y=x^2+4x-10y=x2+4x−10?
- What is the directrix of the parabola y=−2x2+8x−1y=-2x^2+8x-1y=−2x2+8x−1?
- What is the focus point of the parabola x=2y2+16y−5x=2y^2+16y-5x=2y2+16y−5?
- What is the directrix of the parabola x=y2+8y+10x=y^2+8y+10x=y2+8y+10?
- A parabola has a focus point at (4,32)(4,\frac32)(4,23) and a directrix of y=12y=\frac12y=21. What is the equation of the parabola?