Let .
Apply the power rule: goes to
Then, apply the chain rule. Multiply by :
Let .
The derivative of is .
Then, apply the chain rule. Multiply by :
Differentiate term by term:
Apply the power rule: goes to
The derivative of the constant is zero.
The result is:
The result of the chain rule is:
The result of the chain rule is:
Now simplify:
The answer is:
4
5*log (x + 5)
-------------
x + 5
3
5*log (5 + x)*(4 - log(5 + x))
------------------------------
2
(5 + x)
2 / 2 \
10*log (5 + x)*\6 + log (5 + x) - 6*log(5 + x)/
-----------------------------------------------
3
(5 + x)