-16t^2+72t=81

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Solution for -16t^2+72t=81 equation: 



-16t^2+72t=81

We move all terms to the left:

-16t^2+72t-(81)=0

a = -16; b = 72; c = -81;
Δ = b2-4ac
Δ = 722-4·(-16)·(-81)
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$t=\frac{-b}{2a}=\frac{-72}{-32}=2+1/4$

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