4 est-il solution de l'équation x² - 9 = 3x-5?

By: USER7716
27 Agustus 2025 mathematiques 5 minutes
4.5
46 views 46 comments 13 shares

Question

Grade: Education Subject: mathematiques
4 est-il solution de l'équation x² - 9 = 3x-5?
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Answer (46)

Best Answer
(131)

Bonsoir,

x² - 9 = 4² - 9 = 16 - 9 = 7

3 * 4 - 5 = 12 - 5 = 7

L'égalité est vraie pour x = 4.

Answered on 27 Agustus 2025
(198)

Bonjour;

x²-9 -> 4² -9 = 16-9 = 7

3x-5 -> 3*4 -5 = 12-5 = 7

4 est la solution

Answered on 27 Agustus 2025

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Bonjour je n’arrive pas à trouver des arguments ainsi que des exemples merci d’avance


Sujet de réflexion :

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Pouvez vous m aidez svp merci!!
Dans la grille ci dessous il y avait des lettres...chaque lettre a été remplacée par un nombre relatif.
Pour dechiffrer le message ci-dessous,il suffit de placer les 26 lettres de l alphabet dans l ordre sur une droite graduée en prenant la lettre P pour origine.
-15 ; 6 ; -11 ; -12 ; -5 ; 7 ; 9 ; -5 ; -13 ; -11 ; 3 ; 4 ; -12 ; -11 ; -4 ; -15 ; -14 ; -1 ; -3 ; -14 ; -11
Trouver alors l abscisse des autres lettres afin de décoder le messag

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