Find the Following $\sqrt { \mathrm { x } ^ { 2 } }$

Multiple Choice

Find the following. Assume that the letter can represent any real number.
- $\sqrt { \mathrm { x } ^ { 2 } }$

A) $| x |$
B) $x$
C) $- | x |$
D) $\left| x ^ { 2 } \right|$