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4d^2+1=4d
We move all terms to the left:
4d^2+1-(4d)=0
a = 4; b = -4; c = +1;
Δ = b2-4ac
Δ = -42-4·4·1
Δ = 0
Delta is equal to zero, so there is only one solution to the equation
Stosujemy wzór:$d=\frac{-b}{2a}=\frac{4}{8}=1/2$
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