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.

Answer 1

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

Answer 2

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

Answer 3

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

Answer 4

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

Answer 5

Yes!

Answer 6

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

Answer 7

Well, the method you understood.

Answer 8

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

Answer 9

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