bonjour
1) Aire = ( 3 x -2 ) ( 2 x + 1) = 6x² + 3 x - 4 x - 2 = 6 x² - x - 2
2 ) Aire = ( x - 1 )² = x² - 2 x + 1
3) aire totale = 6 x² -x - 2 + x² - 2 x + 1 = 7 x² - 3 x - 1
4) si x = 5 , aire = 7*5² - 3*5 - 1 = 175 - 15 - 1 = 159
