Question

Find gof if f(x) = x + 7 and g(x) = 3x - 2.

Answers:

3x + 5

3x - 5

3x + 19

-3x - 19

Answer 1

@Vocaloid

Answer 2

g o f means g(f(x))

so, substitute f(x) for x in g(x)

g(f(x)) = 3(f(x)) - 2 = 3(x+7) - 2

Answer 3

expand that out and you'll have your answer

Answer 4

@Vocaloid This is my first time doing this and I'm still kind of confused

Answer 5

is that more clear?

Answer 6

If there are too many x's for you, try 3a-2
a= (x+7) now put (x+7) where a is

Answer 7

Okay, so what do I do next?

Answer 8

@Vocaloid @mthompson440

Answer 9

3(f(x)) - 2 = 3(x+7) - 2 = ?

Answer 10

I'm not sure what's next

Answer 11

@Vocaloid @mthompson440

Answer 12

distribute the 3

A(B+C) = A*B + A*C

3(x + 7) = ?

Answer 13

@Vocaloid So I would multiply x and 7 by 3, right?

Answer 14

yes

Answer 15

So I would get 3 and 21. Now what?