42=20t-4.9t^2

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Solution for 42=20t-4.9t^2 equation: 



42=20t-4.9t^2

We move all terms to the left:

42-(20t-4.9t^2)=0

We get rid of parentheses

4.9t^2-20t+42=0

a = 4.9; b = -20; c = +42;
Δ = b2-4ac
Δ = -202-4·4.9·42
Δ = -423.2
Delta is less than zero, so there is no solution for the equation

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