If possible, factor 169x^2 - y^2.

(13x - y) (13x + y)

Step-by-step explanation:

Both 169x^2 and y^2 are perfect squares.

The (special) rule for factoring the difference of two squares is

a^2 - b^2 = (a - b) (a + b).

Therefore, 169x^2 and y^2 = (13x - y) (13x + y)