Looking at this type of problem, the easiest way to do this is to look for the highest base in the denominator and then to divide everything through by it. So in this case, 4 to the X, SO2 to the X / 4 to the X -, 3 to the X / 4 to the X, etcetera. That simplifies to 1/2 to the X minus the quantity 3/4 to the X over the quantity 3/4 to the X - 1 when X goes to Infinity. If we have a number less than one to Infinity, it goes to 0, so we get 0 - 0 / 0 - 1, which is just zero.