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-12x^2+60x-75=0
a = -12; b = 60; c = -75;
Δ = b2-4ac
Δ = 602-4·(-12)·(-75)
Δ = 0
Delta is equal to zero, so there is only one solution to the equation
Stosujemy wzór:$x=\frac{-b}{2a}=\frac{-60}{-24}=2+1/2$
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