## Solmyr 3 years ago Consider the functions f(x) = x2 − 13 and g(x) = x + 5. What is the value of (f + g)(3)? −4 4 −32 8

1. amorfide

f(3) + g(3) substitute x=3 into the function f then substitute 3 into the function g then add the answers together

2. hartnn

what di u get?

3. Solmyr

idk i dont understand how to do these

4. hartnn

u know how to find f(3) ?

5. Solmyr

nope

6. Solmyr

its been a while since i did these and i forgot

7. amorfide

f(x) is a function containing x if you want f(3) you want a function containing 3's so wherever x was originally you would replace them all with 3

8. hartnn

to get f(3) put x=3 in f(x)

9. amorfide

so for your function f(x) = x2 − 13 you want to replace all x with 3 so you get f(3)=3²-13 then do the same with g then add your answers

10. Solmyr

f(2) = (2)2 - 13 and g(2) = 2 + 5?

11. Solmyr

i mean three lol

12. Solmyr

f(3) = (3)2 - 13 and g(3) = 3 + 5?

13. amorfide

yes that is right

14. amorfide

15. Solmyr

f(3) = 9 - 13 = f(3) = -4

16. Solmyr

g(3) = 3 + 5 = g(3) = 8

17. Solmyr

now what do i do???

18. amorfide

f+g -4+8

19. Solmyr

wait when i do f+g what do i do with the 3's??

20. Solmyr

-4+8=4

21. Solmyr