Answer:
( -4920)
Explanation:
we see that the first term is 3 and the common ratio between the succeeding terms is -3. so to solve for the sum of the first 8 terms
Sum = (a1)(1 – r^n) / (1 – r)
and substituting the known terms,we got
Sum = (3)(1 – (-3)^8)/(1 - (-3)) = -4920
Then the answer = ( -4920)