Question 1195289
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g(x) = 2x - 1
g(x) = 2( x ) - 1
g(f(x)) = 2( f(x) ) - 1
g(f(x)) = 2( 3x+1 ) - 1
g(f(x)) = 2(3x)+2(1) - 1
g(f(x)) = 6x+2 - 1
g(f(x)) = <font color=red>6x+1</font>


Explanation: 
We start with the outer function g(x). Replace each copy of x with f(x). 
Then plug in f(x) = 3x+1 and simplify.
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