We have made up functions here. Remember with made up functions, you simply look at the new set of rules they give you and walk it through. In the value on the left, fitting it into the made up function, and substituting 5 for A, and 2 for B, we end up with 5x2-(5+2). So, that is going to equal 3. And, substituting 2 for A and 5 for B, we find that 2x5 -(2+5) is also equal to 3. So, we find that the answer C, the values are equal, is the correct answer.