f(x) = 7x – 3

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter8: Linear Functions
Section8.7: Function Notation
Problem 19E
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Find a  domain on which f is one-to-one and a formula for the inverse off restricted to this domain. Sketch the graphs off and f- 1.

f(x) =
7x – 3
Transcribed Image Text:f(x) = 7x – 3
Expert Solution
Step 1: We have to find domain on which f is one-to-one.

Given, 

                f(x) = 17x-3

Here we have to find domain of f(x) on which f is one-to one.

Remind that a function is one-to-one if no two elements in the domain of f corresponds to the same elements

in the range of f.

That means each x in the domain has exactly one image in the range(co-domain).

 We can observe that the given relation f is function on (-,)-{37} ( since f is not defined for  7x-3=0 x=3/7).

That means the domain of   f(x) = 17x-3 is     (-,)-{37}

Step 2:

Also we can observed that given function is one-to-one.

 Because         f(x1)=f(x2)  17x1-3=17x2-3    7x1-3=7x2-3          7x1=7x2            x1=x2   f is one-one on  (-,)-{3/7}

Now we find inverse of given function.

 

                

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