Remember that the difference of the squares is the following equation:
[tex](a+b)(a-b)=a^2-b^2[/tex]
in this case, the expressions that represent a differents of squares problem are:
[tex]\begin{gathered} (x-5)(x+5)=x^2-25 \\ (2x-6)(2x+6)=4x^2-36 \\ (m+2)(m-2)=m^2-4 \end{gathered}[/tex]
