Could someone please help me solve them? These were on my test, but I didn't manage to do them.

1) $\displaystyle (x^{2}-5x+5)^{(x^{2}-9)}=1$

2) if $\displaystyle 2^{x} =15 $ and $\displaystyle 15^{y}=32 $

How much is $\displaystyle xy$?

Thank you!