Bonsoir,
Développement :
A= (x-2)^2-(2x+3)^2
A = x² - 4x + 4 - (4x² + 12x + 9)
A = x² - 4x + 4 - 4x² - 12x - 9
A = - 3x² - 16x - 5
B=(3-x)^2-(3x+2)^2
B = 9 - 6x + x² - (9x² + 12x + 4)
B = 9 - 6x + x² - 9x² - 12x - 4
B = - 8x² - 18x + 5
C=(-x+4)^2-(6x-1)^2
C = x² - 8x + 16 - (36x² - 12x + 1)
C = x² - 8x + 16 - 36x² + 12x - 1
C = - 35x² + 4x + 15
D=(3x+2)^2-(2x+7)^2
D = 9x² + 12x + 4 - (4x² + 28x + 49)
D = 9x² + 12x + 4 - 4x² - 28x - 49
D = 5x² - 16x - 45
