Bonjour,
3)
A = (3x + 5)²
A = 9x² + 30x + 25
B = 12 - 4 (6x - 7)
B = 12 - 24x + 28
B = - 24x + 40
C = (2/3x + 4) (2/3x - 4)
C = 4/9x² - 16
D = (3x - 4) (2x + 5)
D = 6x² + 15x - 8x - 20
D = 6x² + 7x - 20
E = (5 - 6x) - (5 + 6x)
E = 5 - 6x - 5 - 6x
E = - 12x
4)
A = 16x² - 24x + 9
A = (4x - 3)²
B = 21x - 7
B = 7 (3x - 1)
C = 81x² - 4
C = (9x - 2) (9x + 2)
D = 3 (2x - 5) + 8x (2x - 5)
D = (2x - 5) (8x + 3)
