
Concept explainers
To find:The standard equation of the ellipse with the given characteristics in the graph.

Answer to Problem 21E
The equation of the ellipse is (x−2)222+(y+1)212=1 .
Explanation of Solution
Given information:
The graph of the ellipse is shown below.
Calculation:
The major axis of the ellipse is horizontal. So, the general equation of ellipse is (x−h)2a2+(y−k)2b2=1 .
From the graph, the vertices are (0,−1),(4,−1) and (2,0),(2,−2) .
Therefore, the center of the ellipse is at midpoint of the vertices.
12[(0,−1)+(4,−1)]=(2,−1)
So, the center of the ellipse is the point (2,−1) .
The length of the major axis is the distance between the points (0,−1) and (4,−1) .
√(0−4)2+(−1−(−1))2=√42=4
The length of the minor axis is the distance between the points (2,0) and (2,−2) .
√(2−2)2+(0−(−2))2=√22=2
Use the formula of length of major axis.
2a=4a=2
Use the formula of length of minor axis.
2b=2b=1
Substitute 2 for a , 1 for b , 2 for h and −1 for k in the general equation of ellipse.
(x−h)2a2+(y−k)2b2=1(x−2)222+(y−(−1))212=1(x−2)222+(y+1)212=1
Therefore, the equation of the ellipse is (x−2)222+(y+1)212=1 .
Chapter 9 Solutions
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