To find : the domain of the function so that the function is one-to-one and has an inverse function. And find the inverse function.

Answer to Problem 85E
The domain of function f is x≥−2 for having one-to-one function and inverse function is f−1(x)=x−2.
Explanation of Solution
Given information :
The function f(x)=|x+2|.
Calculation : the domain of function is all real numbers. To having the function one-to-one and inverse, for every value of x , there should be unique value of y.
So the domain of function should be x≥−2 .
To find the inverse function substitute f(x)=y in the function and simplify it,
f(x)=|x+2|y=|x+2| [substitute f(x)=y]x+2=y [remove mod with positive sign for x≥−2]x=y−2 [subtract 2 from both side]f−1(x)=x−2 [simplify]
Thus, the inverse function is f−1(x)=x−2.
The domain of the function f is all real values because function is defined for all real values.
The range of the function f is [0,∞) , the minimum value 0 is occur at x=−2.
The domain of function f−1 is the range of the function f.
Thus, the domain of the function f−1 is [0,∞).
For range of the function f−1 , the minimum value −2 is occur at x=0 ,
Thus, the range of the function f−1 is [−2,∞).
Chapter 1 Solutions
PRECALCULUS W/LIMITS:GRAPH.APPROACH(HS)
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