80=20t-5t^2

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Solution for 80=20t-5t^2 equation: 



80=20t-5t^2

We move all terms to the left:

80-(20t-5t^2)=0

We get rid of parentheses

5t^2-20t+80=0

a = 5; b = -20; c = +80;
Δ = b2-4ac
Δ = -202-4·5·80
Δ = -1200
Delta is less than zero, so there is no solution for the equation

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