## gjhfdfg 2 years ago Find the derivative of f at x.

1. gjhfdfg

f(x) = 7x + 8; x = 5

2. gjhfdfg

Is it 35? I feel like this is to easy & I'm just not seeing it.

3. darth

7(5)+8 =43

4. darth

simple subt.

5. Hoa

@darth take "derivative"

6. jamesHayek

Are you asked to take a limit? if f(x)=7x+8 then f(x)'=7 If you plug in your value of "5" and take the derivative you get 0. I don't fully understand your question.

7. gjhfdfg

43 isnt one of the answer choices

8. jamesHayek

9. Hoa

7?

10. gjhfdfg

I did the same thing first, I plugged then 5 in then solved it & got 43 but then it wasnt one of my choices.

11. gjhfdfg

A. 40 B. 8 C. 35 D. 7

12. Hoa

D.

13. jamesHayek

7

14. darth

i's 7.

15. Hoa

@darth better

16. jamesHayek

Then asked for the derivative of f(x), I belvie the question is worded wrong.

17. darth

but what does the x=5 has to do with it?

18. gjhfdfg

I don;t know, I didnt type the question.

19. Hoa

nothing! the derivative of f doesn't depend on x. that what it means