bonsoir
aire carré = ( 2 x - 3 )²
aire AFED = ( 2 x - 3) ( x + 1)
aire BCEF = ( 2 x - 3)² - ( 2 x - 3) ( x + 1)
2) aire = 4 x² - 12 x + 9 - ( 2 x² + 2 x - 3 x - 3)
= 4 x² - 12 x + 9 - 2 x² - 2 x + 3 x + 3
= 2 x² - 11 x + 12
3) A = ( 2 x - 3) ( 2 x - 3 - x - 1)
= ( 2 x - 3) ( x - 4)
4) pour x = 5 , aire = ( 5 - 3) ( 5 - 4) = 2 * 1 = 2