Answer: option c.
Explanation:
To solve the given exercise and write the expression as a single logarithm, you must keep on mind the following properties:
![m*log(a)=log(a)^m](https://img.qammunity.org/2020/formulas/mathematics/high-school/nq7380uf32c60u9tevy7ysd43ekqe9megx.png)
![log(a)-log(b)=log((a)/(b))](https://img.qammunity.org/2020/formulas/mathematics/high-school/q4zc2a2u5xv4g6etkacp5nbn3xvd5w8zj7.png)
Therefore, by applying the properties shown above, you can rewrite the expression given, as following:
![2logx-6log(x-9)=logx^2-log(x-9)^6=log((x^2)/((x-9)^6))](https://img.qammunity.org/2020/formulas/mathematics/high-school/xncnd6lbprrl80o6sq3zuajao1g5v7375p.png)
Then as you can see, the answer is the option c.