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-9+24d-16d^2=0
a = -16; b = 24; c = -9;
Δ = b2-4ac
Δ = 242-4·(-16)·(-9)
Δ = 0
Delta is equal to zero, so there is only one solution to the equation
Stosujemy wzór:$d=\frac{-b}{2a}=\frac{-24}{-32}=3/4$
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