Find the vertex, focus, and directrix of the parabola (x − 6)2 − 2( y + 7) = 0, and sketch its graph.

College Algebra
7th Edition
ISBN:9781305115545
Author:James Stewart, Lothar Redlin, Saleem Watson
Publisher:James Stewart, Lothar Redlin, Saleem Watson
Chapter7: Conic Sections
Section: Chapter Questions
Problem 1T
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Find the vertex, focus, and directrix of the parabola (x − 6)2 − 2( y + 7) = 0, and sketch its graph.

Expert Solution
Step 1

Given:

The equation of the parabola is,

x-62-2y+7=0

The above equation can be converted into vertex form as,

2y+7=x-62          y=12x-62-14          y=12x-62-7                      (1)

The vertex form of a parabola whose vertex h, k with concave up and axis parallel to y-axis is given as,

y=ax-h2+k                                  (2)

 

 

Step 2

On comparing equation (1) and (2),

a=12h=6k=-7

Therefore, the vertex of the given parabola is at 6, -7.

From the vertex form y=ax-h2+k, the coordinates of the focus is at h,k+14a.

k+14a=-7+14×12            =-132

Hence, the focus of the parabola is at 6, -132.

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