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25x^2+40x+16=0
a = 25; b = 40; c = +16;
Δ = b2-4ac
Δ = 402-4·25·16
Δ = 0
Delta is equal to zero, so there is only one solution to the equation
Stosujemy wzór:$x=\frac{-b}{2a}=\frac{-40}{50}=-4/5$
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