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a2 = 6
a1 = a3 = 20
a1q = 6
a1 + a1q² = 20
q = 6/a1
a1 +36/a1 = 20 →a1²/a1 +36/a1 = 20→ (a1²+36)/a1 = 20 →a1²-20a1+36=0
Δ=256
√Δ = 16
a1 = 2 ∨ a1 = 18
q =3 q = 1/3