Concept explainers
To verify: The functions f and g are inverses by showing f(g(x))=x , and g(f(x))=x .
Given data: The functions f(x) and g(x) are; f(x)=7x and g(x)=7x .
Method/Formula used:
The composite functions of two functions f(x) and g(x) are denoted by (fοg)(x) and (gοf)(x) given by (fοg)(x)=f(g(x)) , and (gοf)(x)=g(f(x)) .
Verification:
The given functions are; f(x)=7x and g(x)=7x . Therefore,
f(g(x))=f(g(x)) ←substitute 7xfor g(x)=f(7x) ←use definition of f(x)=7x=77/x ←simplify=x
Further,
g(f(x))=g(f(x)) ←substitute 7xfor f(x)=g(7x) ←use definition of g(x)=7x=77/x ←simplify=x
Now, f(g(x))=x⇒ g=f−1(x) , i.e., the function g is the inverse of function f .
Also, g(f(x))=x⇒f=g−1(x) , i.e., the function f is the inverse of function g .
That shows the function f and g are inverses.
Chapter 1 Solutions
PRECALCULUS:GRAPH...-NASTA ED.(FLORIDA)
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