Answer:
its 3 because 4^-n=1/256
We move all terms to the left:
4^-n-(1/256)=0
We add all the numbers together, and all the variables
-n+4^-(+1/256)=0
We add all the numbers together, and all the variables
-1n-(+1/256)=0
We get rid of parentheses
-1n-1/256=0
We multiply all the terms by the denominator
-1n*256-1=0
We multiply elements
-256n-1=0
We move all terms containing n to the left, all other terms to the right
-256n=1
n=1/-256
n=-1/256