Sagot :
bonjour
A = 21 x² - 3 x + 7 x - 1 + 29 x² + x + 21 x - 12 + 1 - x
= 50 x² + 25 x - 12
B = 25 x² + 20 x + 20 x + 16 + 25 x² - 35 x + 20 x - 28
= 50 x² + 25 x - 12
Bonjour
A = (3x + 1) (7x - 1) + x (29x + 1) + 3 (7x - 4) + 1 - x
A = 21x² - 3x + 7x - 1 + 29x² + x + 21x - 12 + 1 - x
A = 21x² + 29x² - 3x - x + 7x + 21x + x - 1 + 1 - 12
A = 50x² + 25x - 12
B = (5x + 4) (5x + 4) + (5x + 4) (5x - 7)
B = 25x² + 20x + 20x + 16 + 25x² - 35x + 20x - 28
B = 25x² + 25x² + 20x + 20x + 20x - 35x + 16 - 28
B = 50x² + 25x - 12.
A = B.