Bonjour
A = (3x + 2)²
A = 9x² + 12x + 4
B= (3x + 8) (3x - 8)
B = 9x² - 64
C = (- 4x - 1)²
C = 16x² + 8x + 1
D = (2x + 1) (3 - x) - (2 - x) (3x + 2)
D = 6x - 2x² + 3 - x - (6x + 4 - 3x² - 2x)
D = 6x - 2x² + 3 - x - 6x - 4 + 3x² + 2x
D = - 2x² + 3x² + 6x - 6x + 2x - x + 3 - 4
D = x² + x - 1
E = (x + 1)² + (2x - 1)²
E = x² + 2x + 1 + 4x² - 4x + 1
E = x² + 4x² + 2x - 4x + 1 + 1
E = 5x² - 2x + 2.
