a. y b. y 3+ 2- 1 -5-4-32- 1 2 3 -2- -4-3 -2 -11, 1 2 3 4 -3- -3- с. y d. y 5- 3- 2- 1+ 4+ + 2- 3 1- + -5-4-3-2-11 1 2 3 ++ x 12 3 4 -4-3 -2 -2- -3- -2. -3-

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
icon
Related questions
Question

Find the vertex, focus, and directrix of the parabola with the given equation (x + 1)2 = -4(y + 1). Then match the equation to one of the graphs that are shown and labeled (a)–(d).

a.
y
b.
y
3+
2-
1
-5-4-32-
1 2 3
-2-
-4-3 -2
-11,
1 2 3 4
-3-
-3-
с.
y
d.
y
5-
3-
2-
1+
4+
+
2-
3
1-
+
-5-4-3-2-11 1 2 3
++ x
12 3 4
-4-3 -2
-2-
-3-
-2.
-3-
Transcribed Image Text:a. y b. y 3+ 2- 1 -5-4-32- 1 2 3 -2- -4-3 -2 -11, 1 2 3 4 -3- -3- с. y d. y 5- 3- 2- 1+ 4+ + 2- 3 1- + -5-4-3-2-11 1 2 3 ++ x 12 3 4 -4-3 -2 -2- -3- -2. -3-
Expert Solution
Step 1

Given:

The equation of a parabola is,

x+12=-4y+1

The above equation can be converted into vertex form as,

y=-14x+12-1            (1)

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

y=-ax-h2+k           2

 

Step 2

On comparing equation (1) and (2),

a=14h=-1k=-1

Therefore, the focus of the given parabola is at -1, -1.

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

k-14a=-1-14×14             =-2

Hence, the focus is at -1, -2.

 

steps

Step by step

Solved in 3 steps

Blurred answer
Knowledge Booster
Parabolas
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, calculus and related others by exploring similar questions and additional content below.
Recommended textbooks for you
Calculus: Early Transcendentals
Calculus: Early Transcendentals
Calculus
ISBN:
9781285741550
Author:
James Stewart
Publisher:
Cengage Learning
Thomas' Calculus (14th Edition)
Thomas' Calculus (14th Edition)
Calculus
ISBN:
9780134438986
Author:
Joel R. Hass, Christopher E. Heil, Maurice D. Weir
Publisher:
PEARSON
Calculus: Early Transcendentals (3rd Edition)
Calculus: Early Transcendentals (3rd Edition)
Calculus
ISBN:
9780134763644
Author:
William L. Briggs, Lyle Cochran, Bernard Gillett, Eric Schulz
Publisher:
PEARSON
Calculus: Early Transcendentals
Calculus: Early Transcendentals
Calculus
ISBN:
9781319050740
Author:
Jon Rogawski, Colin Adams, Robert Franzosa
Publisher:
W. H. Freeman
Precalculus
Precalculus
Calculus
ISBN:
9780135189405
Author:
Michael Sullivan
Publisher:
PEARSON
Calculus: Early Transcendental Functions
Calculus: Early Transcendental Functions
Calculus
ISBN:
9781337552516
Author:
Ron Larson, Bruce H. Edwards
Publisher:
Cengage Learning