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2i^2-12i+18=0
a = 2; b = -12; c = +18;
Δ = b2-4ac
Δ = -122-4·2·18
Δ = 0
Delta is equal to zero, so there is only one solution to the equation
Stosujemy wzór:$i=\frac{-b}{2a}=\frac{12}{4}=3$
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