bonjour
A = ( 3 x - 2 )² - 9
A = 9 x² - 12 x + 4 - 9 = 9 x² - 12 x - 5
B = ( 3 x - 2 - 3 ) ( 3 x - 2 + 3 ) = ( 3 x - 5 ) ( 3 x + 1 )
A pour x = √2
( 3 √2 - 2 )² - 9 = 18 - 12 √2 + 4 - 9 = 11 - 12 √2
A = 0
( 3 x - 5 ) ( 3 x + 1 ) = 0
x = 5/3 ou - 1/3
A = 16
( 3 x - 2 )² - 9 = 16
( 3 x - 2 )² - 9 - 16 = 0
( 3 x - 2 )² - 25 = 0
( 3 x - 2 - 5 ) ( 3 x - 2 + 5 ) = 0
( 3 x - 7 ) ( 3 x + 3 ) = 0
x = 7/3 ou - 1
