18=-16t^2

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Solution for 18=-16t^2 equation: 



18=-16t^2

We move all terms to the left:

18-(-16t^2)=0

We get rid of parentheses

16t^2+18=0

a = 16; b = 0; c = +18;
Δ = b2-4ac
Δ = 02-4·16·18
Δ = -1152
Delta is less than zero, so there is no solution for the equation

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