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a₃ = a₁*q²
a₆= a₁*q⁵
8 = a₁q²
-64/27 = a₁q⁵
a₁= 8/q²
-64/27 = 8/q₂*q⁵
-64/27 = 8q³
-8/27 = q³
q=-2/3
a₁ = 8:4/9 = 8*9/4
a₁ = 18
an = 18*-2/3^n-1
^ potęga