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4n(n-5)+25=0
We multiply parentheses
4n^2-20n+25=0
a = 4; b = -20; c = +25;
Δ = b2-4ac
Δ = -202-4·4·25
Δ = 0
Delta is equal to zero, so there is only one solution to the equation
Stosujemy wzór:$n=\frac{-b}{2a}=\frac{20}{8}=2+1/2$
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