Bonjour,
Développer et réduire ces expressions :
A= 7 (2x-3)- 2x (5x-8)
A = 14x - 21 - 10x² + 16x
A = - 10x² + 14x + 16x
A = - 10x² + 30x
B= 13- 2x- 5x (2x-3)
B = 13 - 2x - 10x² + 15x
B = - 10x² - 2x + 15x + 13
B = - 10x² + 13x + 13
C= (4x+2) (-3x+5) -(7x-6)
C = - 12x² + 20x - 6x + 10 - 7x + 6
C = - 12x² + 20x - 6x - 7x + 10 + 6
C = - 12x² + 7x + 16
D= (2x-5)²-(x-3) (3x+2)
D = 4x² - 20x + 25 - (3x² + 2x - 9x - 6)
D = 4x² - 20x + 25 - 3x² - 2x + 9x + 6
D = 4x² - 3x² - 20x - 2x + 9x + 25 + 6
D = x² - 13x + 31.
