12=-16t^2=18t=5

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Solution for 12=-16t^2=18t=5 equation: 



12=-16t^2=18t=5

We move all terms to the left:

12-(-16t^2)=0

We get rid of parentheses

16t^2+12=0

a = 16; b = 0; c = +12;
Δ = b2-4ac
Δ = 02-4·16·12
Δ = -768
Delta is less than zero, so there is no solution for the equation

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