-39,062
-87,342
-195,312
- 976,562
geometric series where a₁=-2 and r=5
Sn=a₁*(r^n -1)/r-1
S8=-2*(5^8 -1)/5-1 =>-195312
-2 + - 10 + - 50 + - 250 + - 1,250 + - 6,250 + -31,250 + - 156,250.
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Verified answer
geometric series where a₁=-2 and r=5
Sn=a₁*(r^n -1)/r-1
S8=-2*(5^8 -1)/5-1 =>-195312
-2 + - 10 + - 50 + - 250 + - 1,250 + - 6,250 + -31,250 + - 156,250.