Hello,

I'm at a lost as to what to do here. I asked a teacher for help and he said these are based on certain kinds of logarithmic proof, but I've not been taught then.

If these really are based on certain logarithmic proofs, can someone fill me in on it so I can try the questions, please.

Prove the following:

1) 1/logxXYZ + 1/logyXYZ + 1/logzXYZ = 1 =>NUMERATOR IS 1.

2) if a, b and c are positive real integers, then (log$\displaystyle a$b)(log$\displaystyle b$c)= (log$\displaystyle a$c)