Question

Let f(x) = 9x - 2 and g(x) = -x + 3. Find f(g(x)).
I just got a whole bunch of help with solving these kind of problems, but because I don't have a value for X, its' throwing me off. Please help! am i over thinking it?

Answer 1

just replace for x in f(x) with whole function g(x)
so you would have f(g(x))=9(-x+3)-2

Answer 2

How would i go about solving that though?

Answer 3

just like any other equation?

Answer 4

just muliply with the 9 in front of the parenthesis

Answer 5

sooo, f(g(x)) = -9x + 27 -18?

Answer 6

no you dont multiply everything just what is in the parentheses

Answer 7

you dont multiply the 2

Answer 8

Oh, so (-9x +27) -2?

Answer 9

yeah you dont need the parentheses anymore so you would have just -9x+27-2
now you can do one more simplification

Answer 10

-9x + 25, right?

Answer 11

yeap thats correct

Answer 12

oh, that's it? thanks so much. (:

Answer 13

yeap thats it :) , ur welcome