# Thread: Differentiation help

1. ## Differentiation help

I have to differentiate this function:
f(x)=x + 2/3x^2-1

if i can also get the forumla for differentiation that will also be a big help

2. Originally Posted by excelsion
f(x)=x + 2/3x^2-1
Please, use the appropriate brackets when posting.

$f(x)=\frac{x+2}{3x^2-1}\,?$

Then rewrite the function as $(x+2)(3x^2-1)^{-1}.$ Now to take its derivative, use the product rule and remember the chain rule.

3. sorry about that lemme try.....
is it 9x^2+12x-1
actually should it be
6x+1?
first time forgot the ^-1 from putting bottom up top

4. Huh?

May I ask if you write the full question please?

5. it just says:
Differentiate:
f(x)= (x+2)/(3x^2-1)

6. Okay. Anyway, I didn't understand the post #3

Well then, follow the given instructions on post #2.

7. i did that and got
6x+1
is that correct?

8. I'm afraid it is not.

You can use this useful tool to check your work.

9. that suggest i use quotient rule but im not dividing two fuctions im just trying to find the derivative of that one fucntion