Question

Use the functions f(x) and g(x) to answer the question.

F(x)=4x-5 ; g(x)= +3

Which expression is equal to (gof)(x)

4x+7
5x-2
4x-2
4x+12

Im not sure how to do this??

Answer 1

It appears that g(x) is constant, so it does not matter what f is.

Fix the typo. Then just substitute f(x) for x in the definition of g.

(g◦f)(x) = g(f(x))

That is, if g(x) = x+3,
(g◦f)(x) = g(f) = f+3 = 4x-5+3 = 4x-2

Answer 2

Thank you! I have to write that down for a example. I have others to do :)

Answer 3

Im trying to get it

Which expression is equal to (fog)(x)?
f(x)=3x-2 ; g(x)=x-4

I got 3x+6 ...

But thats not a answer chioicd the answer choicd close to it 3x-6
and the other options are
3x-14
3x^3+8
4x-6