25t-5t^2+30=61.25

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Solution for 25t-5t^2+30=61.25 equation: 



25t-5t^2+30=61.25

We move all terms to the left:

25t-5t^2+30-(61.25)=0

We add all the numbers together, and all the variables

-5t^2+25t-31.25=0

a = -5; b = 25; c = -31.25;
Δ = b2-4ac
Δ = 252-4·(-5)·(-31.25)
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$t=\frac{-b}{2a}=\frac{-25}{-10}=2+1/2$

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