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12c^2+18c+6.75=0
a = 12; b = 18; c = +6.75;
Δ = b2-4ac
Δ = 182-4·12·6.75
Δ = 0
Delta is equal to zero, so there is only one solution to the equation
Stosujemy wzór:$c=\frac{-b}{2a}=\frac{-18}{24}=-3/4$
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