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25=12t-4.9t^2
We move all terms to the left:
25-(12t-4.9t^2)=0
We get rid of parentheses
4.9t^2-12t+25=0
a = 4.9; b = -12; c = +25;
Δ = b2-4ac
Δ = -122-4·4.9·25
Δ = -346
Delta is less than zero, so there is no solution for the equation
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