If x - y = 13 and xy = 25, then the value of x^2 - y^2 = ?

We know that,

a² - b² = (a + b) (a – b)

If x - y  = n

then, x + y  = \(\sqrt {n^2 + 4xy}\)

If x - y = 13

xy = 25,

x + y = \(\sqrt {13^2 + 4 × 25}\) = \(\sqrt {269}\)

then the value of $x^2 - y^2$ = $13\sqrt{269}$