bonjour
8 x² = 10 x
8 x² - 10 x = 0
2 x ( 4 x - 5 ) = 0
x = 0 ou 5/4
( 2 x - 3 )² = 4 x²
( 2 x - 3 )²- 4 x² = 0
( 2 x - 3 - 2 x ) ( 2 x - 3 + 2 x ) = 0
- 3 ( 4 x - 3 ) =0
x = 3/4
( x + 3/2 )² = ( 2 x - 1/3 ) ²
( x + 3/2)² - ( 2 x - 1/3 )² = 0
( x + 3/2 + 2 x - 1/3 ) ( x + 3/2 - 2 x + 1 /3 ) = 0
( 3 x + 7/6 ) ( - x + 11/6 ) = 0
x = - 7/18 ou 11/6
9 x² - 49 = ( x - 1 ) ( 3 x + 7 )
( 3 x - 7 ) ( 3 x + 7 ) - ( x - 1 ) ( 3 x + 7 ) = 0
( 3 x + 7 ) ( 3 x - 7 - x + 1 ) = 0
( 3 x + 7 ) ( 2 x - 6 ) = 0
2 ( 3 x + 7 ) ( x - 3 ) = 0
x = - 7/3 ou 3
