For $f ( x ) = \sqrt { x } - \sqrt { x - 169 }$

Multiple Choice

For $f ( x ) = \sqrt { x } - \sqrt { x - 169 }$ , find x such that $f ( x ) = 1$ .

A) 14,450
B) 14,112
C) 28,900
D) 7,056
E) $7,225$