HCF and LCM

Hi my good friends,

me again....

Factoring the following 3 equations:

1). $3x^2-x-14$

   $(3x-7)(x+2)$

2). $3x^2-13x+14$

    $(3x-7)(x-2)$

3). $x^2-4$

     $(x-2)(x+2)$

LCM = $(3x-7)(x+2)(x-2)$ Which can be written $(3x-7)(x^2-4)$

HCF however is not present?..Am I making a mistake here?

Thank you all kindly...