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The question asks for \((f (g(x))\).

You know that \(g(x) = 5x\). What is \(f(5x)\) then?

Yes. So it's F(x)=15x-42...But what method is it??

@ParthKohli ?? is that right and is it equal to F(x) or y?

Yes!

Sorry, I was late. You don't have any \(y\) in the equation, do you?

Well, the method you understood.

Yes but what's the name? Substitution? Thank you :)

Yes, substitution maybe. I haven't heard of different methods: this one is the only one I know of.