Digital PSAT Math Practice Question 191: Answer and Explanation
Question: 191
In the equation y = 2xn, in which x is an integer greater than 1, what is a possible value of n that will ensure that the expression has exponential growth?
- A. 0
- B. 1
- C. 4
- D. Not sufficient information
Correct Answer: C
Explanation:
(C) A value of 4 for n will ensure that the expression has exponential growth since any power of 2 or greater will ensure exponential growth in the function. Anything raised to the 0 power simply equals 1. Anything raised to an exponent of 1 is simply itself. So choices (A) and (B) result in lines, not exponential functions.
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