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Odp. Szosty wyraz tego ciagu jest rowny 0.
Δ=b²-4ac
Δ=16+48=64
√Δ=8
n1=(-b+√Δ)/2a
n1=(4+8)/2=12/2 =6
n=6
n2=(-b-√Δ/2a <0 nie dotyczy