Let .
Apply the power rule: goes to
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:
Now simplify:
The answer is:
2 / 2\ / 2\ 8*\-1 + x / *\-1 + 7*x /
/ 2\ / 2\ 48*x*\-1 + x /*\-3 + 7*x /