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400=-16t^2+0
We move all terms to the left:
400-(-16t^2+0)=0
We get rid of parentheses
16t^2-0+400=0
We add all the numbers together, and all the variables
16t^2+400=0
a = 16; b = 0; c = +400;
Δ = b2-4ac
Δ = 02-4·16·400
Δ = -25600
Delta is less than zero, so there is no solution for the equation
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