Question

f(x)=x^2+3x and g(x)= 2x-1

what is f(g(x))

Answer 1

Rewrite f(x) as f(y). That is, where ever you see x in f(x), call it y instead.

Answer 2

Then, say y = g(x) = 2x-1

Plug that into your "new" f(y) and simplify.

Answer 3

in class we didnt need to change anything to y or simplify turely what i really need to know is do i plug f into g or g into f. i know its one or the other

Answer 4

You're plugging g into f

I just have people change x to y to avoid confusion.

Answer 5

f(g(x)), is basically write down f(x), but replace every x with the equation of g(x)

Answer 6

(g of x)^2+3(g of x) =
(2x-1)^2+3(2x-1)

simplify

Answer 7

thank you!!