bonjour
( x + 6 )² = ( x + 6 ) ( 5 x - 2 )
( x + 6 )² - ( x + 6 ) ( 5 x - 2 ) = 0
( x + 6 ) ( x + 6 - 5 x + 2 ) = 0
( x + 6 ) ( - 4 x + 8 ) = 0
Equation produit nul , donc x = - 6 ou x = 2
16 x² - 49 = 0
( 4 x - 7 ) ( 4 x + 7 ) = 0
x = 7/4 ou - 7/4
( 3 x - 1 ) / ( x + 2) = 4
3 x - 1 = 4 x + 8
3 x - 4 x = 8 + 1
- x = 9
x = - 9
3 / ( x - 4 ) = 6 / ( 1 - 2 x )
3 - 6 x = 6 x - 24
- 6 x - 6 x = - 24 - 3
- 12 x = - 27
x = 27/12 = 9/4
