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4s^2+8s+4=0
a = 4; b = 8; c = +4;
Δ = b2-4ac
Δ = 82-4·4·4
Δ = 0
Delta is equal to zero, so there is only one solution to the equation
Stosujemy wzór:$s=\frac{-b}{2a}=\frac{-8}{8}=-1$
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