490=-360t^2+840t

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Solution for 490=-360t^2+840t equation: 



490=-360t^2+840t

We move all terms to the left:

490-(-360t^2+840t)=0

We get rid of parentheses

360t^2-840t+490=0

a = 360; b = -840; c = +490;
Δ = b2-4ac
Δ = -8402-4·360·490
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$t=\frac{-b}{2a}=\frac{840}{720}=1+1/6$

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