bonjour
A = ( 3 x - 2 )² - 64
A = 9 x² - 12 x + 4 - 64
A = 9 x² - 12 x - 60
A = ( 3 x - 2 - 8 ) ( 3 x- 2 + 8 )
A = ( 3 x - 10 ) ( 3 x + 6 )
A = 0 quand x = 10/3 ou - 6/3 = - 2
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bonjour
A = ( 3 x - 2 )² - 64
A = 9 x² - 12 x + 4 - 64
A = 9 x² - 12 x - 60
A = ( 3 x - 2 - 8 ) ( 3 x- 2 + 8 )
A = ( 3 x - 10 ) ( 3 x + 6 )
A = 0 quand x = 10/3 ou - 6/3 = - 2