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-720=16t^2+64t
We move all terms to the left:
-720-(16t^2+64t)=0
We get rid of parentheses
-16t^2-64t-720=0
a = -16; b = -64; c = -720;
Δ = b2-4ac
Δ = -642-4·(-16)·(-720)
Δ = -41984
Delta is less than zero, so there is no solution for the equation
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