Given expression is
.
(Product property of square roots:
)

(Prime factorization of 169)
(Evaluate powers:
)
(Cancel square and root:
)
(Evaluate powers:
)
(Product property of square roots:
)
(Cancel square and root: 
(Evaluate powers:
)
(Product property of square roots:
)
(Cancel square and root:
)

The solutions is
.