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800=18t-5t^2
We move all terms to the left:
800-(18t-5t^2)=0
We get rid of parentheses
5t^2-18t+800=0
a = 5; b = -18; c = +800;
Δ = b2-4ac
Δ = -182-4·5·800
Δ = -15676
Delta is less than zero, so there is no solution for the equation
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