Answer to GMAT Question #6

Here is the answer to GMAT Practice Question #6

Answer: D

Explanation:
This question requires a deep understanding of exponents and the exponent rules, as well as a little creativity. It is definitely hard, and it’s not enough for us to just lay out the solution. We must talk a little about how to recognize what the right way to solve it is.

The short answer is "practice". The long answer is "practice, practice, practice." Doesn’t sound like a great answer, but it is the only way you will be prepared for a question like this. The fact is that there are only 7 or 8 exponent rules. The test can’t make up any new ones; they can only find new ways to test you on them. The more confident you are with the exponent rules, the more you practice manipulating exponent questions, the more comfortable you will be with problems like this. Remember, math is finite. You can learn all the rules. But your ability to master those rules depends on you and the amount you practice.

The answer and explanation to GMAT Practice Question #6 was written by Integrated Learning, a company that provides professional and private one on one tutoring services.