Réponse :
bonsoir
Explications étape par étape :
A = (x - 2)(x + 2)⇒ identité remarquable (a - b)(a + b) = a² - b²
A = x² - 2²
A = x² - 4
B = (5 - y)(5 + y)
B = 5² - y²
B = 25 - y²
C = (3x + 5)(3x - 5)
C = (3x)² -5²
C = 9x² - 25
D = (10 - 7z)(10 + 7z)
D = 10² - (7z)²
D = 100 - 49z²
E = (5 + 4g)(5 - 4g)
E = 5² - (4g)²
E = 25 - 16g²
F = (2,1x- 3)(2,1x + 3)
F = (2,1x)² -3²
F = 4,41x² - 9
G = (2i + 6,1)(2i - 6,1)
G = (2i)² - 6,1²
G = 4i² - 37,21
H = (4 - 3,2j)(3,2j + 4)
H = - (3,2j - 4)(3,2j + 4)
H = - ( ( 3,2j)² - 4²)
H = - 10,24j² + 16
bonne soirée
