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"Kvadratroten ur" är motsatsen till "upphöjt till ". Om man höjer upp ett tal med och sedan drar kvadratroten ur potensen tar dessa beräkningar alltså ut varandra, t.ex. Men, detta gäller endast om talet inte är negativt. För t.ex. gäller inte likheten eftersom Man får alltså inte tillbaka , utan resultatet blir alltid positivt. Regeln gäller alltså bara för .

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