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25u^2+20u+4=0
a = 25; b = 20; c = +4;
Δ = b2-4ac
Δ = 202-4·25·4
Δ = 0
Delta is equal to zero, so there is only one solution to the equation
Stosujemy wzór:$u=\frac{-b}{2a}=\frac{-20}{50}=-2/5$
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