Réponse :
bonjour
E = (7x - 2)(8-3x) - (4x - 5)(7x-2)
= (7x-2)( 8-3x - (4x -5) )
= (7x - 2) ( 8 -3x -4x + 5 )
= (7x - 2) ( 13 - 7x)
F = 49x² - ( 4x-5)²
= (7x)² - (4x-5)²
= (7x - (4x-5))( 7x+4x-5)
= (7x - 4x + 5)( 7x +4X - 5 )
= (3x + 5)(11x-5)
voila :)
