bonjour,
A= x² - 4 = (x-2)(x+2
B = 9 - x² = (3-x)(3+x)
C= 25 - x² = (5-x) (5+x)
D= 16 - 9x² = (4-3x) (4+3x)
E=4 - 64x² = (2-8x) (2+8x)
F = (x + 2)² - 9 = (x+2-3)(x+2+3) = (x-1) ( x+5)
G= 16-(3x + 4)² = (4-3x+4) ( 4+3x+4) = (-3x +8) ( 3x+8)
a² -b² = (a+b) (a-b)