Bonjour
Développe puis réduis les expressions :
A = (9x - 7)²
A = 81x² - 126x + 49
B = (x + 9) (11 - 5x)
B = 11x - 5x² + 99 - 45x
B = - 5x² + 11x - 45x + 99
B = - 5x² - 34x + 99
C = (2x - 3)(2x + 3)
C = 4x² - 9
D = (11 + 8x)²
D = 121 + 176x + 64x².
E = (x + 1)² + 7x (2 - x)
E = x² + 2x + 1 + 14x - 7x²
E = x² - 7x² + 2x + 14x + 1
E = - 6x²+ 16x + 1
F = (x + 3) (2x - 1) - 3x (2x + 5)
F = 2x² - x + 6x - 3 - 6x² - 15x
F = 2x² - 6x² - x - 15x + 6x - 3
F = - 4x² - 10x - 3.
