Given the parent functions f(x) = log2 (3x − 9) and g(x) = log2 (x − 3), what is f(x) − g(x)?

f(x) − g(x) = log2 (2x − 6)f(x) − g(x) = log2 (2x − 12)f(x) − g(x) = log2 f(x) − g(x) = log2 3