3n^2+30n+75=0

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Solution for 3n^2+30n+75=0 equation: 



3n^2+30n+75=0

a = 3; b = 30; c = +75;
Δ = b2-4ac
Δ = 302-4·3·75
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$n=\frac{-b}{2a}=\frac{-30}{6}=-5$

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