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h^2-30h+225=0
a = 1; b = -30; c = +225;
Δ = b2-4ac
Δ = -302-4·1·225
Δ = 0
Delta is equal to zero, so there is only one solution to the equation
Stosujemy wzór:$h=\frac{-b}{2a}=\frac{30}{2}=15$
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