bonjour
9 y + 12 = 3 ( 3 y + 4 )
x² + 5 x = x ( x + 5 )
( x + 1 )² - 2 ( x + 1 ) = ( x + 1 ) ( x + 1 - 2 ) = ( x + 1 ) ( x - 1 )
( t - 7 ) ( 2 t + 1 ) + ( 2 t + 1) ²
= ( 2 t + 1) ( t - 7 + 2 t + 1 )
= ( 2 t + 1 ) ( t - 6)
( x + 2 ) ( 2 x - 1 ) + ( x + 2 ) ( 3 x + 2 )
( x + 2 ) ( 2 x - 1 + 3 x + 2 )
= ( x + 2 ) ( 5 x + 1 )
( 5 x - 3 ) ( x - 7 ) - ( 2 x + 4) ( x - 7 )
= ( x - 7 ) ( 5 x - 3 - 2 x- 4)
= ( x - 7 ) ( 3 x - 7 )
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bonjour
9 y + 12 = 3 ( 3 y + 4 )
x² + 5 x = x ( x + 5 )
( x + 1 )² - 2 ( x + 1 ) = ( x + 1 ) ( x + 1 - 2 ) = ( x + 1 ) ( x - 1 )
( t - 7 ) ( 2 t + 1 ) + ( 2 t + 1) ²
= ( 2 t + 1) ( t - 7 + 2 t + 1 )
= ( 2 t + 1 ) ( t - 6)
( x + 2 ) ( 2 x - 1 ) + ( x + 2 ) ( 3 x + 2 )
( x + 2 ) ( 2 x - 1 + 3 x + 2 )
= ( x + 2 ) ( 5 x + 1 )
( 5 x - 3 ) ( x - 7 ) - ( 2 x + 4) ( x - 7 )
= ( x - 7 ) ( 5 x - 3 - 2 x- 4)
= ( x - 7 ) ( 3 x - 7 )