1) q = b2/b1 = -12/3 = -4
2) b5 = b1*q^4 = 81*(-2/3)^4 = 16
3) b6 = b4*q^2
96=24*q^2
q^2=4
q=+-4
4) q = b2/b1 = 2/-1 = -2
S8 = b1*(q^8-1)/q-1 = -1*((-2)^8-1)/-3 = 85
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1) q = b2/b1 = -12/3 = -4
2) b5 = b1*q^4 = 81*(-2/3)^4 = 16
3) b6 = b4*q^2
96=24*q^2
q^2=4
q=+-4
4) q = b2/b1 = 2/-1 = -2
S8 = b1*(q^8-1)/q-1 = -1*((-2)^8-1)/-3 = 85