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)=3x−2 and g(x)=x+23 .
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)=3x−2 and g(x)=x+23 . Therefore,
f(g(x))=f(g(x)) ←substitute(x+23)for g(x)=f(x+23) ←use definition of f(x)=3x−2=3(x+23)−2 ←simplify=x+2−2 =x
Further,
g(f(x))=g(f(x)) ←substitute(3x−2)for f(x)=g(3x−2) ←use definition of g(x)=x+23=(3x−2)+23 ←simplify=3x−2+23 =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:...COMMON CORE ED.-W/ACCESS
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