20=-16t^2

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Solution for 20=-16t^2 equation: 



20=-16t^2

We move all terms to the left:

20-(-16t^2)=0

We get rid of parentheses

16t^2+20=0

a = 16; b = 0; c = +20;
Δ = b2-4ac
Δ = 02-4·16·20
Δ = -1280
Delta is less than zero, so there is no solution for the equation

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