How do I do f(g(2))?

Question

f(x) = 3x + 2

and

g(x) = x - 3

Its due tomorrow, please help! :)

Answer 1

I don't understand your question. But if your talking about pounching someone then i suggest that when the dude trys to hit you. dunk.

Answer 2

plug in 2 to the g function and then the answer to the g function to the f function.

x - 3

2 - 3 = -1

g= -1

3x+2

3(-1) +2 = -1

f(g(2))= -1

Answer 3

3x+2(x-3(2))

3x+2 (x-6)

3x+2x-12

5x-12

x=12/5

Answer 4

This is called a composition function. It works by first plugging in the variable into the inner most function then using that answer to plug in for x.

First plug 2 into the function g. g(2) = 2 - 3 = -1.

Simply find f(-1) now.

Hope this helps.  Composition functions can be tricky to understand at first as the notation is weird but they become easy.