jika X1 dan X2 adalah akar-akar persamaan kuadrat 2ײ - 8× + 4 = 0 adalah
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[tex]2 {x}^{2} - 8x + 4 = 0 \\ {x}^{2} - 4x + 2 = 0 \\ {x}^{2} - 4x + ( {2}^{2} ) = - 2 + ( {2}^{2} ) \\ (x - 2) {}^{2} = - 2 + 4 \\( x - 2) {}^{2} = 2 \\ x - 2 = ± \sqrt{2} \\ \bf \: x1 = \sqrt{2} + 2 \\ \bf \: x2 = - \sqrt{2} + 2[/tex]
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