## anonymous 3 years ago Just want an answer checked: Find the derivative of the function given below. y = (3x4 – 3x + 5)^-3

1. anonymous

$-3 x (\frac{ 4x^3-3 }{ (3x^4-3x+5)^-4 }$

2. anonymous

that's not a -3x, it's -3 times the fraction.

3. hartnn

why is there 3x multiplied ?

4. hartnn

then you are correct!

5. anonymous

yay~~~ :)

6. anonymous

there should be 12 x^3 in place of 4x^3

7. anonymous

why?

8. anonymous

it should be 12x^2 shouldnt it?

9. anonymous

can you write correct answer for us

10. anonymous

12x^3, i see why.

11. hartnn

-3*(4x-3) will give -12x^3 +9 @uzumakhi

12. anonymous

i didn't do out the derivative, i get it.

13. anonymous

so i was right to begin with?

14. anonymous

now im confused.. was my answer okay in the first place?

15. anonymous

$-3(\frac{ 12x ^{3}-3 }{ (3x ^{4}-3x + 5)^{4} })$

16. anonymous

17. hartnn

oh , yes.....sorry! u missed the 3 @uzumakhi is correct. sorry for confusion :(

18. anonymous

no i have the same now because when you take the derivative of 3x^4-3x+5 it is 12x^3-3, i forgot to place my power rule on my 3x^4

19. anonymous

that i want to tell in begining

20. anonymous

i gotcha!

21. anonymous