Bonjour !
A(x) = (5x - 2)² + (3x - 1)(x + 1)
A(x) = 25x² - 20x + 4 + 3x² - x + 3x - 1
A(x) = 28x² - 18x + 3
B(x) = (6x - 1)(x - 1)²
B(x) = (6x - 1)(x² - 2x + 1)
B(x) = 6x³ - 12x² + 6x - x² + 2x - 1
B(x) = 6x³ - 13x² + 8x - 1
C(x) = (x + 2)²
C(x) = x² + 4x + 4
D(x) = (2x - 1)²
D(x) = 4x² - 4x + 1
J'espère t'avoir aidé. Bon courage !
