21x^2+84x+84=0

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Solution for 21x^2+84x+84=0 equation: 



21x^2+84x+84=0

a = 21; b = 84; c = +84;
Δ = b2-4ac
Δ = 842-4·21·84
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$x=\frac{-b}{2a}=\frac{-84}{42}=-2$

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