7a^2-28a+28=0

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Solution for 7a^2-28a+28=0 equation: 



7a^2-28a+28=0

a = 7; b = -28; c = +28;
Δ = b2-4ac
Δ = -282-4·7·28
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$a=\frac{-b}{2a}=\frac{28}{14}=2$

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