I'm studying for the GRE and going through and reviewing. I have a question about the properties of the means of exponents, I hope this is the right place to post this thread. I'm doing a practice test and I came across this question that I can't figure out how they came to the answer:
If 1 + x + x2 + x3 = 60, then the average (arithmetic mean) of x, x2, x3, and x4 is equal to which of the following?
The correct answer is b) 15x but I can't figure out how to arrive at that answer.
Any input would be appreciated!