Réponse :
bonjour
- x² + 3 x = - x ( x - 3 )
6 x² - 2 x = 2 x ( 3 x - 1 )
- 5 x² + x = x ( - 5 x + 1 )
1 - x² = ( 1 - x ) ( 1 + x )
x² - 2 x + 1 = ( x - 1 )²
x² - 4 x + 4 = ( x - 2 )²
4 x² - 9 = ( 2 x - 3 ) ( 2 x + 3 )
x² - 3 = ( x - √3 ) ( x + √3)
( 2 x + 3 )² - ( x - 1 ) ² = ( 2 x + 3 + x - 1 ) ( 2 x +3 - x + 1 ) = ( 3 x + 2 ) ( x + 4 )
5 x = 4
x = 4/5
- 3 x + 5 = 0
- 3 x = - 5
x = 5/3
5 + 2 t = - 1 + 5 t
2 t - 5 t = - 1 - 5
- 3 t = - 6
t = 2
( 3 - 2 x ) - ( x + 1 ) = 0
3 - 2 x - x - 1 = 0
- 3 x = 1 - 3
- 3 x = - 2
x = 2/3
( 2 - t ) ( 3 t - 1 ) = 0
t = 2 ou 1/3
3 x ( 5 x - 2 ) 0
x = 0 ou 2/5
Explications étape par étape
