Réponse :
bonjour
x² = 4
x² - 4 = 0
( x - 2 ) ( x + 2 ) = 0
x = 2 ou - 2
4 x² = 4
4 x² - 4 = 0
( 2 x - 2 ) ( 2 x + 2 ) = 0
x = 1 ou - 1
x² + 27 = 0
x² = - 27
pas de solution
- 3 x² = - 27
- x² = - 9
x² = 9
x = 3 ou - 3
25 x² = 0
x = 0
4 x² - 2 = 1
4 x² - 1 = 0
( 2 x - 1 ) ( 2 x + 1 ) = 0
x = 1/2 ou - 1/2
