La racine carrée principale d'un nombre non négatifaaest le nombre non négatifbbtel queb2=ab^2=a. Notation :a\sqrt{a}. L'équationx2=ax^2=aaveca>0a>0a deux racines :x=±ax=\pm\sqrt{a}; la racine carrée principale est la racine non négative.
a≥0\sqrt{a}\ge0toujours (à l'écolea≥0a\ge0)
(a)2=a(\sqrt{a})^2=a, a2=∣a∣\sqrt{a^2}=|a|
Quanda=0a=0: x2=0⇒x=0x^2=0\Rightarrow x=0
Valeur de la racine carrée principale.
Factor under the radical
64\sqrt{64}
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