Bonjour
A = x (x + 6) - x
A = x² + 6x - x
A = x² + 5x
B = x (y - 2) + xy
B = xy - 2x + xy
B = 3xy - 2x
C = 3x (x + 4) - 6x²
C = 3x² + 12x - 6x²
C = - 3x² + 12x
D = 9x (x² - 6) + 2x²
D = 9x³ - 54x + 2x²
D = 9x³ + 2x² - 54x
E = 5x (3 + 5x) + x (5 + x) + 4x (2x + 1)
E = 15x + 25x² + 5x + x² + 8x² + 4x
E = 25x² + x² + 8x² + 15x + 5x + 4x
E = 34x² + 24x
F = 7x (3x - 5) - 6x (7 + 7x)
F = 21x² - 35x - 42x - 42x²
F = 21x² - 42x² - 35x - 42x
F = - 21x² - 77x
G = 9 (3 + 9x) + 4x² (7 - 12x) - 11x (- 5 + 8x)
G = 27 + 81x + 28x² - 48x³ + 55x - 88x²
G = - 48x³ + 28x² - 88x² + 81x + 55x + 27
G = - 48x³ - 60x² + 136x + 27.
