# Thread: How To Find The Derivative Of These...?

1. ## How To Find The Derivative Of These...?

We learnt something called the "chain rule" last class.

I'm doing my best to understand it...

These are the hardest questions, and I don't know how to start or finish..

Can anybody show me how to find the derivatives of these:

1) (sqrt(5x))/(2x^2-3)

2) f(x) = sqrt(2x(sqrt(x+3)) (Square root of the square root)

Thanks!

2. Look this links

Chain rule whit an example
http://www.mathhelpforum.com/math-he...tml#post215062

Then

$
f(x) = \sqrt {2x\sqrt {x + 3} } \Rightarrow f'(x) = \frac{1}
{{2\sqrt {2x\sqrt {x + 3} } }} \cdot \left( {2x\sqrt {x + 3} } \right)^\prime
$

Now use the product rule

P.D: I dont know why the link has name...