bonjour
( x+ 6 )² - ( 3 x - 1 )²
= ( x + 6 - 3 x + 1 ) ( x + 6 + 3 x - 1 )
= ( - 2 x + 7 ) ( 4 x + 5 )
( x + 3 ) ( 3 - 2 x ) - ( x + 3 ) ( 5 + x )
= ( x + 3 ) ( 3 - 2 x - 5 - x )
= ( x + 3 ) ( - 3 x - 2 )
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bonjour
( x+ 6 )² - ( 3 x - 1 )²
= ( x + 6 - 3 x + 1 ) ( x + 6 + 3 x - 1 )
= ( - 2 x + 7 ) ( 4 x + 5 )
( x + 3 ) ( 3 - 2 x ) - ( x + 3 ) ( 5 + x )
= ( x + 3 ) ( 3 - 2 x - 5 - x )
= ( x + 3 ) ( - 3 x - 2 )