bonjour
( 3 x + 1 )² - ( 5 x - 1 )²
= ( 3 x + 1 + 5 x - 1 ) ( 3 x + 1 - 5 x + 1)
= 8 x ( - 2 x + 2 )
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bonjour
( 3 x + 1 )² - ( 5 x - 1 )²
= ( 3 x + 1 + 5 x - 1 ) ( 3 x + 1 - 5 x + 1)
= 8 x ( - 2 x + 2 )