Respuesta :

[tex]\begin{gathered} x^2-9=(x-3)(x+3) \\ x=x \\ 7x-2=7x-2 \\ 12x^2-20x-8=(4x-8)(3x+1) \\ 2x^2+5x-25=(2x-5)(x+5) \end{gathered}[/tex]

RELAXING NOICE
Relax