Répondre :
V= (x-2) (x+2) - (3x + 1 ) (2x -3)
= x² + 2x -2x -4 - 6x² - 9x + 2x - 3
= 5x² + 7x -1
U= (2/3x - 4)²
= (2/3 x - 4) (2/3x - 4)
= 4/6x² - 16/3x + 16
V = (x-2)(x+2)-(3x+1)(2x-3)
U= (2 sur 3 x -4)²
V= (x-2) (x+2) - (3x + 1 ) (2x -3)
= x² + 2x -2x -4 - 6x² - 9x + 2x - 3
= 5x² + 7x -1
U= (2/3x - 4)²
= (2/3 x - 4) (2/3x - 4)
= 4/6x² - 16/3x + 16