Sagot :
Bonjour
M = (3x - 5) (2x + 1) - (3x - 5) (x + 4)
M = 6x² + 3x - 10x - 5 - (3x² + 12x - 5x - 20)
M = 6x² + 3x - 10x - 5 - 3x² - 12x + 5x + 20
M = 6x² - 3x² + 3x + 5x - 10x - 12x - 5 + 20
M = 3x² - 14x + 15
N = (5x - 2) (2x + 3) + (2x + 3) (7x + 2)
N = 10x² + 15x - 4x - 6 + 14x² + 4x + 21x + 6
N = 10x² + 14x² + 15x + 21x
N = 24x² + 36x
P = (3x - 2)² - (3x - 2) (5 - 2x)
P = 9x² - 12x + 4 - (15x - 6x² - 10 + 4x)
P = 9x² - 12x + 4 - 15x + 6x² + 10 - 4x
P = 9x² + 6x² - 12x - 4x - 15x + 4 + 10
P = 15x² - 31x + 14