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456=200-16t^2
We move all terms to the left:
456-(200-16t^2)=0
We get rid of parentheses
16t^2-200+456=0
We add all the numbers together, and all the variables
16t^2+256=0
a = 16; b = 0; c = +256;
Δ = b2-4ac
Δ = 02-4·16·256
Δ = -16384
Delta is less than zero, so there is no solution for the equation
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