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rss GMAT Practice Question (One of Hundreds)
Figure 1
What is the value of f(2)?
Correct Answer: B
n-x = 1/nx
  1. The first impulse may be to substitute n = 2 to begin with, and then solve by taking all the numbers out to their exponents. However, it is not necessary to do so, and it is best to wait to substitute n=2 into the function until the end. By waiting, you can simplify the equation greatly, without worrying about huge numbers. The key to solving this problem is to remember that x-y equals 1/xy. So first of all, we will change any negative exponents to positive exponents by moving them to the opposite side of the divisor line.
    Figure 2
  2. Solve for f(2)
    16(2)2 = 16(4) = 64