Find all possible values of the following expressions :
`(i) sqrt(x^(2)-4) (ii) sqrt(9-x^(2)) (iii) sqrt(x^(2)-2x+10)`

Explanation

To find all possible values of the given expressions, we will analyze each expression step by step.

### (i) Expression: \( \sqrt{x^2 - 4} \)

1. **Identify the domain**: The expression under the square root, \( x^2 - 4 \), must be non-negative:
\[ x^2 - 4 \geq 0 \]
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