Sagot :
Bonsoir,
A = 2x - 3 + 8 - 4x + x²
A = x² + 2x - 4x - 3 + 8
A = x² - 2x + 5
B = 3x + 9 - 7x + 8 + 4x
B = 3x + 4x - 7x + 9 + 8
B = 17.
Réponse : Cc, voilà la réponse
A = 2x - 3 + 8 - 4x + x2*
A = x2* + 2x - 4x - 3 + 8
A = x2* -2x + 5
( *x2 = x au carré )
B = 3x + 9 - 7x + 8 + 4x
B = 3x + 4x - 7x + 9 + 8
B = 7x - 7x + 17
B = 0 + 17
B = 17