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4-20x+25x^2=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:$x=\frac{-b}{2a}=\frac{20}{50}=2/5$
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