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0=-4.9t^2-1.5
We move all terms to the left:
0-(-4.9t^2-1.5)=0
We add all the numbers together, and all the variables
-(-4.9t^2-1.5)=0
We get rid of parentheses
4.9t^2+1.5=0
a = 4.9; b = 0; c = +1.5;
Δ = b2-4ac
Δ = 02-4·4.9·1.5
Δ = -29.4
Delta is less than zero, so there is no solution for the equation
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