bonsoir
(x+3)(-3x-1)+(-6-2x)(3x+1)
= ( x + 3 ) ( - 3 x - 1 ) - 2 ( 3 + x ) ( 3 x + 1 )
= ( x + 3 ) [ ( - 3 x - 1 - 2 ( 3 x + 1 ) ]
= ( x + 3 ) ( - 3 x - 1 - 6 x - 2 )
= ( x + 3 ) ( - 9 x - 3 )
= 3 ( x + 3 ) ( - 3 x - 1 )
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bonsoir
(x+3)(-3x-1)+(-6-2x)(3x+1)
= ( x + 3 ) ( - 3 x - 1 ) - 2 ( 3 + x ) ( 3 x + 1 )
= ( x + 3 ) [ ( - 3 x - 1 - 2 ( 3 x + 1 ) ]
= ( x + 3 ) ( - 3 x - 1 - 6 x - 2 )
= ( x + 3 ) ( - 9 x - 3 )
= 3 ( x + 3 ) ( - 3 x - 1 )