15=-5t^2

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Solution for 15=-5t^2 equation: 



15=-5t^2

We move all terms to the left:

15-(-5t^2)=0

We get rid of parentheses

5t^2+15=0

a = 5; b = 0; c = +15;
Δ = b2-4ac
Δ = 02-4·5·15
Δ = -300
Delta is less than zero, so there is no solution for the equation

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