BONSOIR AIDEZ MOI SVP à LE CORRIGER

1)
A = (3x - 5)²
A = 9x² - 30x + 25

B = (4x - 3) (4x + 3)
B = 16x² + 12x - 12x - 9
B = 16x² - 9

C = (2x - 6) (x + 7)
C = 2x² + 14x - 6x - 42
C = 2x² + 8x - 42

II)
1)
D = (x - 2)² + (x - 2) (3x + 1)
D = x² - 4x + 4 + 3x² + x - 6x - 2
D = x² + 3x² - 4x - 6x + x + 4 - 2
D = 4x² - 9x + 2

2) Pour x = - 4
D = 4x² - 9x + 2
D = 4 (- 4)² - 9 (- 4) + 2
D = 4 (16) + 36 + 2
D = 64 + 36 + 2
D = 102