Let .
Apply the power rule: goes to
Then, apply the chain rule. Multiply by :
Differentiate term by term:
The derivative of a constant times a function is the constant times the derivative of the function.
Apply the power rule: goes to
So, the result is:
Apply the power rule: goes to
The result is:
The result of the chain rule is:
Now simplify:
The answer is:
4 + x ------------- __________ / 2 \/ 8*x + x
2
(4 + x)
1 - ---------
x*(8 + x)
-------------
___________
\/ x*(8 + x)