Réponse :
Explications étape par étape
A = (3x - 2)²
A = 9x²-2X3xX2+4
A= 9x² - 12x + 4
B = (5x - 3)² + (4 - 9x²)
B = 25x² - 30x + 9 + 16 - 72x + 81x²
B = 106x²-102x+25
C = (7 + 4x)²
C= 49 + 56x+16x²
C= 16x²+56x+49
D = (5x + 3) (5x - 3)
D = 25x²-9
E = (8x + 1)(8x - 1) - (2x + 7)²
E= (64x²-1) - (4x²+28x+49)
E= 64x²-1-4x²-28x-49
E= 60x² -28x -50
F = (4x - 5)² - (8x + 2)²
F= (16x²-40x+25) - (64x²+32x+4)
F= 16x²-40x+25-64x²-32x-4
F= -48x²-72x+21
