bonsoir
E = ( 3 x - 5 )² - 2 ( 3 x - 5 )
1. E = 9 x² - 30 x + 25 - 6 x + 10
= 9 x² - 36 x + 35
2. E = ( 3 x - 5 ) ( 3 x - 5 - 2 )
= ( 3 x - 5 ) ( 3 x - 7 )
3. si x = 2 , E = ( 6 - 5 ) ( 6 - 7 ) = 1 * - 1 = -1
