How to find a focus of a parabola with...
Favorites|Homepage
Subscriptions | sitemap
HOME > Mathematics > How to find a focus of a parabola with...

How to find a focus of a parabola with...

[From: ] [author: ] [Date: 11-05-03] [Hit: ]
the focus is to the right of the vertex ( + x direction).Focus (h + p,Focus (- 3 + 5,Focus (2,......
How to find a focus of a parabola with the vertex (-3,1) and the directrix: x=-8 given? Help please!

-
Vertex (- 3, 1):

h = - 3
k = 1

Directrix: x = - 8

Since the directrix is a function of x, the parabola is parallel to the x-axis.

Distance from focus to vertex = p

p = h - x
p = - 3 - (- 8)]
p = - 3 + 8)
p = 5

Since p is positive, the focus is to the right of the vertex ( + x direction).

Focus (h + p, k)
Focus (- 3 + 5, 1)
Focus (2, 1)
¯¯¯¯¯¯¯¯¯¯¯
1
keywords: parabola,to,How,with,of,find,focus,How to find a focus of a parabola with...
New
Hot
© 2008-2010 http://www.science-mathematics.com . Program by zplan cms. Theme by wukong .