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1210=-640t^2+1760t
We move all terms to the left:
1210-(-640t^2+1760t)=0
We get rid of parentheses
640t^2-1760t+1210=0
a = 640; b = -1760; c = +1210;
Δ = b2-4ac
Δ = -17602-4·640·1210
Δ = 0
Delta is equal to zero, so there is only one solution to the equation
Stosujemy wzór:$t=\frac{-b}{2a}=\frac{1760}{1280}=1+3/8$
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