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25a^2-30a+9=0
a = 25; b = -30; c = +9;
Δ = b2-4ac
Δ = -302-4·25·9
Δ = 0
Delta is equal to zero, so there is only one solution to the equation
Stosujemy wzór:$a=\frac{-b}{2a}=\frac{30}{50}=3/5$
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