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$a^{2} = ∣ a ∣$

Kvadratroten ur ett tal i kvadrat är lika med absolutbeloppet av talet, dvs. det är alltid positivt. Exempelvis är

(- 3)^{2} = ∣ - 3 ∣ = 3 .

Denna regel är också en definition av absolutbelopp.

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