math gcse: express function ff(x) in the form ax+b

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user20031516
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can you show me a step-by-step of this please? the answer is 9x+4, i just don't know how to get there.
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Function f is defined as f(x)= 3x+1

Express the function ff(x) in the form ax+b, stating the values of a and b.
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RDKGames
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(Original post by user20031516)
can you show me a step-by-step of this please? the answer is 9x+4, i just don't know how to get there.
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Function f is defined as f(x)= 3x+1

Express the function ff(x) in the form ax+b, stating the values of a and b.
ff(x) means you input the function into itself.

f(x) = 3x+1 hence ff(x) = 3(3x+1)+1
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user20031516
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(Original post by RDKGames)
ff(x) means you input the function into itself.

f(x) = 3x+1 hence ff(x) = 3(3x+1)+1
Ohhh that makes so much sense! Seems obvious now. Thank you so much
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