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Kvadratrot multiplicerat med sig självt

Kvadratroten ur

a

är det tal man ska multiplicera med sig själv för att få

a .

Multipliceras en kvadratrot med sig själv får man därför talet under rottecknet:

9 \cdot 9 = 3 \cdot 3 = 9 .

Regeln gäller inte för negativa

a

, eftersom rotuttrycken då blir odefinierade.

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