Murray Carrillo
02/11/2023 · Elementary School
Exercice 8 1. Résoudre l'équation \( z^{4}=-4 \). On notera \( z_{K}, z_{L}, z_{M}, z_{N} \) les solutions. 2. Représentez dans le plan complexe muni d'un repère orthonormé \( (O, \vec{i}, \vec{j}) \) les points \( \mathrm{K}, \mathrm{L}, \mathrm{M} \) et N d'affixes respectives \( z_{K}, z_{L}, z_{M} \) et \( z_{N} \) 3. Donnez les composantes des vecteurs \( \overrightarrow{O K}, \overrightarrow{O L}, \overrightarrow{O M} \) et \( \overrightarrow{O N} \) dans la base orthonormée \( (\vec{i}, \vec{j}) \) 4. Calculez le produit scalaire de ces vecteurs pris deux à deux 5. En déduire la nature du quadrilatère DEFG 6. Donnez sa surface
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1. Les solutions de l'équation \( z^{4} = -4 \) sont \( z_{K} = 1 + i \), \( z_{L} = -1 + i \), \( z_{M} = -1 - i \), \( z_{N} = 1 - i \).
2. Le quadrilatère \( KLMN \) est un carré.
3. La surface du carré est \( 4 \).
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