Let .
Then, apply the chain rule. Multiply by :
Differentiate term by term:
Differentiate term by term:
Apply the power rule: goes to
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 derivative of the constant is zero.
The result is:
The result of the chain rule is:
Now simplify:
The answer is:
2 x - 14*x + 50 4 *(-14 + 2*x)*log(4)
x*(-14 + x) / 2 \ 2535301200456458802993406410752*4 *\1 + 2*(-7 + x) *log(4)/*log(4)
x*(-14 + x) 2 / 2 \ 5070602400912917605986812821504*4 *log (4)*(-7 + x)*\3 + 2*(-7 + x) *log(4)/