Lamun dikali dua angka négatip, négatip ganda ngabatalkeun. Jadi `-√2 * -√2 = 2` persis sakumaha bener salaku `√2 * √2 = 2`. Kusabab ieu, urang teu bisa nyaho naha `x` positif atawa négatip di `2x^2 = 4`. Urang bisa mastikeun yén duanana solusi jalan: `` 2*( √2) ^2 = 2*2 = 4 2*(-√2) ^2 = 2*2 = 4 ``
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