please ... aidez moi ... :(

A = (x-2)(x+2) = x² - 2²
B = (5 - y)(5+y) = 5² -y²
C = (3x+5)(3x-5) = (3x)²- 5²
D =(10-7z)(10+7z) = 10² - (7z)²
E = (5+4g)(5-4g) = 5² - (4g)²
F = (2.1x-3)(2.1x+3) = (2.1x)² - 3²
G = (2i+6.1)(2i-6.1) = (2i)² - 6.1²
H = (3.2j+4)(4-3.2j) = (3.2j)² - 4²