Bonjour
Développer les expressions suivantes :
A = 6(2x - 1) + (2x + 1)(x - 3)
A = 12x - 6 + 2x² - 6x + x - 3
A = 2x² + 12x + x - 6x - 6 - 3
A = 2x² + 7x - 9
B = ( - 3x + 2)( -x - 2) - (x + 5)(x - 4)
B = 3x² + 6x - 2x - 2 - (x² - 4x + 5x - 20)
B = 3x² + 6x - 2x - 2 - x² + 4x - 5x + 20
B = 3x² - x² + 6x + 4x - 2x - 5x - 2 + 20
B = 2x² + 3x + 18.
