Bonsoir,
A = x² - 16
A = (x - 4) (x + 4)
B = x² - 7
B = ?
C = 4x² - 9
C = (2x - 3) (2x+ 3)
D = 9x² - 49
D = (3x - 7) (3x + 7)
E = (x + 2)² - 25
E = (x + 2 - 5) (x + 2 + 5)
E = (x - 3) (x + 7)
F = (x - 5)² - 4
F = (x - 5 - 2) (x - 5 + 2)
F = (x - 7) (x - 3)
G = 4 (x + 3)² - 9
G = (2x + 3) (2x + 9)