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36c^2+60c+25=0
a = 36; b = 60; c = +25;
Δ = b2-4ac
Δ = 602-4·36·25
Δ = 0
Delta is equal to zero, so there is only one solution to the equation
Stosujemy wzór:$c=\frac{-b}{2a}=\frac{-60}{72}=-5/6$
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