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Kvadraten av en negativ bas

I en potens med negativ bas och exponenten 2 (eller annan jämn exponent) kan basen skrivas som sin positiva motsvarighet, exempelvis: som båda är lika med 64. Eftersom kvadraten av alla tal ändå är positiv har vi inte förändrat potensens värde genom att skriva basen som positiv.

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