bonjour
( 3 x + 9 ) ² = 9 x² + 54 x + 81
( - 3 x + 9) ² = - ( 3 x - 9 )² = - ( 3 x² - 54 x + 81 )
( - 3 x - 9 )² = - ( 3 x + 9 )² = - ( 9 x² + 54 x + 81 )
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bonjour
( 3 x + 9 ) ² = 9 x² + 54 x + 81
( - 3 x + 9) ² = - ( 3 x - 9 )² = - ( 3 x² - 54 x + 81 )
( - 3 x - 9 )² = - ( 3 x + 9 )² = - ( 9 x² + 54 x + 81 )