The statement is false.
Counter-example:
When n=1, 3^(2(1))-4 = 5 which is a multiple of 5
When n=2, 3^(2(2))-4 = 65 which is not a multiple of 5
Therefore, the statement is false since it is not true for all values of n.
Counter-example is the simplest way to prove that a statement is false.