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Mathematics 20 Online
OpenStudy (anonymous):

find f of g and g of f f(x)=3x; g(x)=2x+3

myininaya (myininaya):

\[f o g(x)=f(g(x))=f(2x+3)\] So you go to the function that is called f and replace all of f input variables x with the very new input variable that is 2x+3

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