If x + y = 15 and xy = 14, then the value of x - y is :

If x + y  = n

then, x - y  = \(\sqrt {n^2 - 4xy}\)

If x + y = 15

xy = 14,

then the value of x - y i= \(\sqrt {15^2 - 4(14)}\)

 x - y i= \(\sqrt {169}\) = 13