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2x^2+-21=0

We add all the numbers together, and all the variables

2x^2=0

a = 2; b = 0; c = 0;

Δ = b^{2}-4ac

Δ = 0^{2}-4·2·0

Δ = 0

Delta is equal to zero, so there is only one solution to the equation

Stosujemy wzór:$x=\frac{-b}{2a}=\frac{0}{4}=0$

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