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q³=a₄:a₁
q³=8/27
q=2/3
x=27*2/3=18
y=18*2/3=12
x²=27y/:27
y²=8x
y=x²/27
(x²/27)²=8x
x⁴/729=8x
x⁴=5832x
x⁴-5832x=0
x(x³-5832)=0
x(x³-18³)=0
x(x-18)(x²+18x+324)=0
x=0 v x=18 v x²+18x+324=0 Δ<0 sprzeczność
x=18
y=18²/27=324/27=12
lub
a₁=27
a₄=8
a₄=a₁·q³
8=27·q³
q³=8/27
q=2/3
27,27·2/3=18,18·2/3=12,8
x=18
y=12