bonjour
( 3 x + 1 ) ( 2 x - 5 ) = 6 x² - 15 x + 2 x - 5 = 6 x² - 13 x - 5
- 2 ( x - 2 ) ( x + 3 ) = - 2 ( x² + 3 x - 2 x - 6 ) = - 2 ( x² + x - 6 ) = - 2 x² - 2 x + 12
( x + 4 )²= x² + 8 x + 16
( 3 - 2 x )² = 9 - 12 x + 4 x²
25 - 5 x = 5 ( 5 - x )
7 ( 3 x + 4 ) - 3 x ( 3 x + 4 ) = ( 3 x + 4 ) ( 7 - 3 x )
x² - 49 = ( x - 7 ) ( x + 7 )
