## Katieann16 2 years ago Help Meeee ):

1. Katieann16

if f(x)= 3/x & g(x)=3x which is true? A) (fog)(2)=2 B) (gof)(0)=0 C) (fog)(9)=1 D) (gof)(-9)=-1

2. Katieann16

@zordoloom

3. jim_thompson5910

first can you tell me what g(2) is?

4. Katieann16

no

5. jim_thompson5910

g(x) = 3x g(2) = 3*2 ... replace EVERY x with 2 g(2) = 6

6. jim_thompson5910

(f o g)(2) = f(g(2)) (f o g)(2) = f(6) (f o g)(2) = ???

7. jim_thompson5910

so how do you find f(6)?

8. Katieann16

f=3?

9. jim_thompson5910

f(x)= 3/x f(6)= 3/6 f(6) = ???

10. Katieann16

?

11. jim_thompson5910

reduce 3/6

12. jim_thompson5910

what do you get?

13. Katieann16

1/2

14. jim_thompson5910

so is (fog)(2)=2 true?

15. Katieann16

yes

16. jim_thompson5910

but we just found that f(6) = 1/2 which pointed to the fact that (f o g)(2) = 1/2

17. Katieann16

but that isnt a choice on the answers?

18. jim_thompson5910

so that rules out choice A

19. Katieann16

so its B?

20. jim_thompson5910

what is f(0)

21. jim_thompson5910

f(x) = 3/x f(0) = 3/0 is that possible?