I understand the substituation part for f(g(x)), but it says to simplify it and thats the part that I don't understand

College Algebra
1st Edition
ISBN:9781938168383
Author:Jay Abramson
Publisher:Jay Abramson
Chapter3: Functions
Section3.7: Inverse Functions
Problem 2SE: Why do we restrict the domain of the function f(x)=x2 to find the function's inverse?
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I understand the substituation part for f(g(x)), but it says to simplify it and thats the part that I don't understand.

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