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12a^2+60a+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:$a=\frac{-b}{2a}=\frac{-60}{24}=-2+1/2$
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