b2=b1*q=12
b5=b2*q^3=-96
q^3=-96/12=-8
q=-2
b1=b2/q=12/(-2)=-6
S(6)=b1(1-q^6)/(1-q)=-6(1-(-2)^6)/(1-(-2))=-6(1-64)/3=-2*(-63)=126
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b2=b1*q=12
b5=b2*q^3=-96
q^3=-96/12=-8
q=-2
b1=b2/q=12/(-2)=-6
S(6)=b1(1-q^6)/(1-q)=-6(1-(-2)^6)/(1-(-2))=-6(1-64)/3=-2*(-63)=126