Solve for the Indicated Variable $Z = A ( 1 + x ) ^ { 1 / 2 }$

Multiple Choice

Solve for the indicated variable.
- $Z = A ( 1 + x ) ^ { 1 / 2 }$ , for $x$

A) $x = \left( \frac { Z } { A } \right) ^ { 2 }$
B) $x = \left( \frac { Z } { A } \right) ^ { 2 } - 1$
C) $x = \left( \frac { A } { Z } \right) ^ { 2 }$
D) $x = \left( \frac { Z } { A } \right) ^ { 2 } + 1$