To show: The function is one to one then find its inverse function and to verify graphically.
Answer to Problem 31E
The function is one to one.
Explanation of Solution
Given information:
Formula used:
One to One:
Concept used:
If a function has an inverse function, then the function is one to one.
A function is one to one graphically, if it satisfies:
- Horizontal line test:
- Vertical line test:
If a horizontal line can be drawn through the graph and the line meets the graph at only one point, the function is said to be one to one.
If a vertical line can be drawn through the graph and the line meets the graph at only one point, the function is said to be one to one.
If one of these tests is true then the function is one to one.
Proof:
First part of the question is to prove one to one.
Consider the given function and substitute
Consider the condition for one to one and then substitute.
Therefore the function is one to one.
Next part of the question is to find the inverse of the given function.
Initially put
Interchange
Now, solve for
Therefore,
Last part is to show graphically that the function is one to one.
When a vertical line is drawn through this graph, it cuts the graph at only one point. Similarly, when a horizontal line is drawn through the graph, it cuts the graph at only one point.
Therefore, it is graphically proved that the function is one to one.
Chapter 2 Solutions
Precalculus with Limits: A Graphing Approach
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