1)27x^9-1;
2)a^15-27b^18;
3)m^9+n^30;
4)343b^6+8
<span> b4= - 1,b7 = 27</span>
bn=b1*q^n-1
b1*q3=-1
b1*q6=27
b1=-1/q^3
(-1/q^3)*q^6=27
-q^3=27
q^3=-27
q=-3