7.2 due Friday October 30

I was really confused in the first example. I followed them when they said 9^5 was congruent to 1 mod 11, but I got lost when they said that x had to be even so magically it was six. Why do we use that formula if it doesn't give us the answer? If it needs to be even, why do we choose six instead of 4??

The other methods were really wordy and I got lost on the explanation.   I am certain though that hey will be helpful! I saw from the homework that when p gets to be large, guessing a lot of numbers take a lot of time! Brute force is not the most practical way to solved r x.