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r^5=128/-4
r^5=-32
r^5=-2^5
r=-2
u4=a×r^(n-1)
-4=a×r^(4-1)
-4 =a×r^3
-4=a×(-2)^3
-4=a×-8
a=-4/-8
a=1/2
s10= a (r^n - 1)/r-1
s10=1/2 (-2^10 -1)/-2-1
s10=1/2 (1024-1)/-3
s10=1/2 (1023)/-3
s10=511,5/-3
s10=-170,5