math

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\(x²-4x+13=0 \)

        p          q

\(\color{blue}x=-\frac{p}{2}\pm \sqrt{(\frac{p}{2})^2-q}\\ x=2\pm\sqrt{2^2-13}\\ x=2\pm\sqrt{9\cdot(-1)}\\ x=2\pm3 \sqrt{-1}\\ x=2\pm3i\)

\(x_1=2+3i\\ x_2=2-3i\)

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