Let .
The derivative of is .
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:
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:
The result is:
The result of the chain rule is:
Now simplify:
The answer is:
2
(7 + 6*x)
6 - -----------
x*(7 + 3*x)
---------------
x*(7 + 3*x)
/ 2\
| (7 + 6*x) |
2*|-9 + -----------|*(7 + 6*x)
\ x*(7 + 3*x)/
------------------------------
2 2
x *(7 + 3*x)