Please help me with a test question. Stuck on it.

[suckatmath3]

Hello everyone, today I had a math test and I did pretty bad on it. I got 100 for knowledge but only 75 for application. One question that I could not answer is the one that I posted below. It is the question at the top and I attach a photo of the work that I have done so far but I am now stuck and do not know what to do. Please help me.

 

[lookagain]

After your second line in your attachment, you could write \(\displaystyle \ \dfrac{log(x^{-1})}{log(a)}\).

Continue from there.

 

[suckatmath3]

After your second line in your attachment, you could write \(\displaystyle \ \dfrac{log(x^{-1})}{log(a)}\).

Continue from there.

Thank you. I got the answer now