If f(x)=1/3x+13 and g(x)=3x^2+6x+12, which expression represents f(g(x))?

Intermediate Algebra
19th Edition
ISBN:9780998625720
Author:Lynn Marecek
Publisher:Lynn Marecek
Chapter8: Roots And Radicals
Section8.7: Use Radicals In Functions
Problem 408E: Explain why the process of finding the domain of a radical function with an even index is different...
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If f(x)=1/3x+13 and g(x)=3x^2+6x+12, which expression represents f(g(x))?
Expert Solution
Step 1

Given that 

f(x) = 1/3x + 13   and g(x) = 3x2 + 6x + 12

we need to find the value of f(g(x)).

Now, 

Replace the value of x in f(x) by g(x) 

So, 

f(g(x)) = 1/3(x2 + 6x + 12) + 13

            = 1/(3x2 + 18x + 36) + 13

 

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