Let f(x)=3x–42 and g(x) =5x.
Part 1 What is (f ◦ g)(x) ?
Part 2 Use complete sentences to describe the method you used to solve this problem.

Question

Let f(x)=3x–42 and g(x) =5x.
Part 1 What is (f ◦ g)(x) ?
Part 2  Use complete sentences to describe the method you used to solve this problem.

parthkohli · Answer

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

parthkohli · Answer

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

anonymous · Answer

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

anonymous · Answer

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

parthkohli · Answer

Yes!

parthkohli · Answer

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

parthkohli · Answer

Well, the method you understood.

anonymous · Answer

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

parthkohli · Answer

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