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16y^2-56y+49=0
a = 16; b = -56; c = +49;
Δ = b2-4ac
Δ = -562-4·16·49
Δ = 0
Delta is equal to zero, so there is only one solution to the equation
Stosujemy wzór:$y=\frac{-b}{2a}=\frac{56}{32}=1+3/4$
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