Understanding Parts c) and d) of Logs/Differentials Problem

[nokia8650]

http://img242.imageshack.us/img242/5020/51620774ed5.th.jpg

http://img258.imageshack.us/img258/1672/72938359qu1.th.jpg

Question and answers above.

I am unable to understand parts c) and d); can someone plase explain them to me! Thanks

 

[cristo]

Have you made an attempt yourself?

 

[nokia8650]

Yes, I have. All I could do for part c was "p+q" = pq. I do not understand part d. Any help is appreciated!

Thanks