a) din primii doi termeni dai factor comun x↑2
x↑2(x+3)-16(x+3)=(x+3)(x↑2-16)=(x+3)(x-4)(x+4)
b) (2x-3)(2x+3)-2(2x-3)=(2x-3)(2x+3-2)=(2x-3)(2x+1)
c) 4x(x+1)-9(x+1)=(x+1)(4x-9)
d) 9x↑2(x+1)-(x+1)=(x+1)(9x↑2-1)=(x+1)*3x-1)(3x+1)
e) 16x↑2(x+1)-9(x+1)=(x+1)(4x-3)(4x+3)
f) 4x↑2(x+1)-9(x+1)=(x+1)(2x-3)(2x+3)