20=-16t^2+40t-18.5

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Solution for 20=-16t^2+40t-18.5 equation: 



20=-16t^2+40t-18.5

We move all terms to the left:

20-(-16t^2+40t-18.5)=0

We get rid of parentheses

16t^2-40t+18.5+20=0

We add all the numbers together, and all the variables

16t^2-40t+38.5=0

a = 16; b = -40; c = +38.5;
Δ = b2-4ac
Δ = -402-4·16·38.5
Δ = -864
Delta is less than zero, so there is no solution for the equation

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