how to find the range

Intermediate Algebra
19th Edition
ISBN:9780998625720
Author:Lynn Marecek
Publisher:Lynn Marecek
Chapter2: Solving Linear Equations
Section2.7: Solve Absolute Value Inequalities
Problem 2.154TI: The ideal diameter of a rod needed for a machine is 75 mm. The actual diameter can vary from the...
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could someone please help me understand how to find the range for this?  I keep getting frustrated because I just don't understand.

Expert Solution
Step 1

Given,

fx = x+4if x<3x-4if x 3   

We have to find the range of fx

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