URGENT ! Je re-poste un message car le dernier était mal formulé. Résoudre les équations : 25 x² - 7 = 0 et ( x - 3 )² = 25 Merci d'avance !

25 x² - 7 = 0
5²x²-V7² =0
(5x-V7)(5x+V7) = 0

5x-V7 =0                             5x+V7 =0
5x =V7                                5x = -V7
x = V7/5                                x =  -V7/5


et ( x - 3 )² = 25
(x-3)² -25 =0
(x-3)² -5² =0
(x-3-5)(x-3+5) =0
(x-8)(x+2) =0

x-8 =0                                          x+2 =0
x = 8                                              x = -2