Bonjour
A = (x - 2) (x + 2)
A = x² - 4
B = (5 - y) (5 + y)
B = 25 - y²
C = (3x + 5) (3x - 5)
C = 9x² - 25
D = (10 - 7z) (10 + 7z)
D = 100 - 49z²
E = (5 + 4g) (5 - 4g)
E = 25 - 16g²
F = (2,1x - 3) (2,1x + 3)
F = 4,41x² - 9
G = (2i + 6,1) (2i - 6,1)
G = 4i² - 37,21
H = (3,2j+ 4) (4 - 3,2j)
H = - 10,24j² + 16.
