bonjour
9 x² - 1 = ( 3 x - 1 ) ( 3 x + 1 )
25 x² + 10 x + 1 = ( 5 x + 1 )²
( x + 1 )² - 9 = ( x + 1 - 3 ) ( x + 1 + 3 ) = ( x - 2 ) ( x + 4 )
( x + 2 )² + 3 ( x + 2 ) = ( x + 2 ) ( x + 2 + 3 ) = ( x + 2 ) ( x + 5 )
x² - x + 1/4 = ( x - 1 /2)²
( 1 - x )² - ( x + 3 ) ² = ( 1 - x + x + 3 ) ( 1 - x - x - 3 ) = 4 ( - 2 x - 2 )
5 ( 2 x - 3 ) ( x + 1 ) + ( 2 x- 3 ) = ( 2 x - 3 ) ( 5 x + 5 + 1 ) = ( 2 x - 3 ) ( 5 x + 6 )
2 x² - 8 x ³ + 5 x² = x ( 2 x - 8 x² + 5 x )
