-20n^2+60n-45=0

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Solution for -20n^2+60n-45=0 equation: 



-20n^2+60n-45=0

a = -20; b = 60; c = -45;
Δ = b2-4ac
Δ = 602-4·(-20)·(-45)
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$n=\frac{-b}{2a}=\frac{-60}{-40}=1+1/2$

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