20t-5t^2=20

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Solution for 20t-5t^2=20 equation: 



20t-5t^2=20

We move all terms to the left:

20t-5t^2-(20)=0

a = -5; b = 20; c = -20;
Δ = b2-4ac
Δ = 202-4·(-5)·(-20)
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$t=\frac{-b}{2a}=\frac{-20}{-10}=+2$

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