Express 2ln𝑥 + 3ln𝑦 – 4ln𝑥𝑦 as a single logarithm.

please explain

Simplify

2 log(x) + 3 log(y) - 4 log(x y) = 0

Combine logarithms. 2 log(x) + 3 log(y) - 4 log(x y) =

log(x^2) + log(1/(x^4 y^4)) + log(y^3)

log((x^2 y^3)/(x^4 y^4)) = log(1/(x^2 y)): log(1/(x^2 y))