Okay,

On my math problem, there's a sign that looks like a big E, with a little six above it, and n=0 below it. Right by that sign, there is 3(-4)n , with the "n" as a superscript. What does that mean, and how do I solve it? Sorry if this doesn't make sense, I'm rather confused myself... Also, I have the answer : 9831

if that helps anyone. Thank you.