Posted by **Angie** on Saturday, September 22, 2012 at 10:45am.

I'm having problems with this one. Can't get the right answer.

Differentiate the following using the chain rule.

f(x) = squareroot(x^2+1)/(3x+1)

I know that I can take the whole thing and put it to the (1/2) and differentiate that then use the quotient rule to differentiate the inside, but when i try to factor I can't get stuck. with 3x^2+2x-3/(3x+1)^2

- Calculus -
**Steve**, Saturday, September 22, 2012 at 3:43pm
assuming you mean

f(x) = √((x^2+1)/(3x+1))

f = u^1/2 where u = (x^2+1)/(3x+1)

so,

f' = 1/2√u u'

u = f/g where

f = x^2+1 and v = 3x+1

so, u' = (f'g-g'f)/g^2 = (3x^2+2x-3)/(3x+1)^2

so f' = 1/[2√((x^2+1)/(3x+1))] * (3x^2+2x-3)/(3x+1)^2

= (3x^2+2x-3)/[2(3x+1)^{3/2}(x^2+1)^{1/2}]

## Answer This Question

## Related Questions

- calculus - I am having trouble with this problem also derivative differentiate f...
- calculus - I have been asked to solve this two different ways. The first way is...
- Math (Calculus) - Hello, Could somebody please help me with the following ...
- calculus - Using the chain rule... how can i differentiate this? y=xã(x-2)
- Calculus - Differentiate using the chain rule: y=(x+(x+x^(1/2))^(1/2))^(1/2) y...
- calculus - Thank you Reiny for replying.I know names have changed. Perhaps I ...
- math - can some one please help me with the following questions as i don't ...
- trigo help! - 1. differentiate cos(3/x) 2. differentiate sin(4/x) 3. ...
- calculus 1 - differentiate x(x-3)^2 do I product and chain rule?
- calculus help - implicit differentation 1.y^3=4(x^2+y^2) 2.y^2-3x+2y=0 help ...

More Related Questions