Answer:
(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)
