Assuming all variables are positive, use properties of logarithms to write the expression as a sum or difference of logarithms or multiples of logarithms.
log base two of quantity x to the ninth power times y to the fifth power divided by eight.

nine times log base two of x minus five times log base two of y minus log base two of eight.

nine times log base two of x plus five times log base two of y minus log base two of eight.

nine times log base two of x times five times log base two of y minus log base two of eight.

nine times log base two of x plus five times log base two of y plus log base two of eight.