Given the equation 25x^2y^2-40xy+16=0, find the value of xy.

Not rlly sure, might be x=4/5y??? i dont know

take the logarithm of both sides (the base of the log doesn't matter):

apply the exponent property - this says that :

distribute the log terms on both sides:

group like terms together:

divide through both sides by the coefficient on :

you can do some additional rewriting here using the properties of the logarithm to simplify things if you like:

4932,9180,7625 are divisible by 9