Help please!!!!

Question

The partial sum  equals

Answer 1

GP, a1 = -2, r=4, an=-2048

an = a1r^(n-1) = -2048 = -2(4^(n-1))

4^(n-1) = 1024

n-1 = 5

n=6th term = -2048

s6 = a1(r^n -1)/(r-1) = -2 -8 -32- 128- 512 - 2048

= --2730=

sum of 1st 6 terms