A = x^2 - 16
A = (x - 4)(x + 4)
B = 1 - y^2
B = (1 - y)(1 + y)
C = 100x^2 - 9
C = (10x - 3)(10x + 3)
D = 36 - 81z^2
D = 9(4 - 9z^2)
D = 9(2 - 3z)(2 + 3z)
E = 4Pi^2 - 25
E = (2Pi - 5)(2Pi + 5)
F = (t + 3)^2 - 16
F = (t + 3 - 4)(t + 3 + 4)
F = (t - 1)(t + 7)
G = (2x + 1)^2 - 25
G = (2x + 1 - 5)(2x + 1 + 5)
G = (2x - 4)(2x + 6)
G = 2(x - 2) * 2(x + 3)
G = 4(x - 2)(x + 3)
H = (3i + 7)^2 - (i + 5)^2
H = (3i + 7 - i - 5)(3i + 7 + i + 5)
H = (2i + 2)(4i + 12)
H = 2(i + 1) * 4(i + 3)
H = 8(i + 1)(i + 3)