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Let F(x)=3x-1 and g(x)=×+2. Findf(g(x)) and g(f(x))

User Anadi
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1 Answer

4 votes

Solution:

Given:


\begin{gathered} f(x)=3x-1 \\ g(x)=x+2 \end{gathered}

To find f(g(x)):


\begin{gathered} f(g(x))\text{ means substitute g\lparen x\rparen into f\lparen x\rparen} \\ f(g(x))=3(x+2)-1 \\ f(g(x))=3x+6-1 \\ f(g(x))=3x+5 \end{gathered}

Therefore, f(g(x)) = 3x + 5

To find g(f(x)):


\begin{gathered} g(f(x))\text{ means substitute f\lparen x\rparen into g\lparen x\rparen} \\ g(f(x))=(3x-1)+2 \\ g(f(x))=3x-1+2 \\ g(f(x))=3x+1 \end{gathered}

Therefore, g(f(x)) = 3x + 1

User Dzamo Norton
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