128=-16t^2+64t

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Solution for 128=-16t^2+64t equation: 



128=-16t^2+64t

We move all terms to the left:

128-(-16t^2+64t)=0

We get rid of parentheses

16t^2-64t+128=0

a = 16; b = -64; c = +128;
Δ = b2-4ac
Δ = -642-4·16·128
Δ = -4096
Delta is less than zero, so there is no solution for the equation

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