^{Ok, the question is: Differentiate: five over the square root of four + x}

- Sep 12th 2012, 03:42 AMcnotesjustfearlessDifferentiation - I thought I had finally got it, but im stuck again!
^{Ok, the question is: Differentiate: five over the square root of four + x} - Sep 12th 2012, 03:57 AMa tutorRe: Differentiation - I thought I had finally got it, but im stuck again!
$\displaystyle \frac{5}{\sqrt{4+x}}=5(4+x)^{-1/2}$

Use the chain rule. - Sep 12th 2012, 04:02 AMcnotesjustfearlessRe: Differentiation - I thought I had finally got it, but im stuck again!
thanks, i got that far. But its after that that I get lost.

The answer says -5 over 2 times the square root of 4 + x cubed

thankyou!