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225=3t-5t^2
We move all terms to the left:
225-(3t-5t^2)=0
We get rid of parentheses
5t^2-3t+225=0
a = 5; b = -3; c = +225;
Δ = b2-4ac
Δ = -32-4·5·225
Δ = -4491
Delta is less than zero, so there is no solution for the equation
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