Use the imaginary number $$ i $$ to rewrite the expression below as a complex number. Simplify all radicals. $$ -\sqrt{-23} $$

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To rewrite the expression $$ -\sqrt{-23} $$ as a complex number using the imaginary unit $$ i $$, follow these steps:

1. **Understand the Imaginary Unit $$ i $$:**
   The imaginary unit is defined as $$ i = \sqrt{-1} $$. This allows us to express the square root of negative numbers in terms of $$ i $$.

2. **Rewrite the Square Root:**
   $$
   \sqrt{-23} = \sqrt{23} \cdot \sqrt{-1} = \sqrt{23} \cdot i = i\sqrt{23}
   $$

3. **Include the Negative Sign:**
   $$
   -\sqrt{-23} = -i\sqrt{23}
   $$

4. **Express as a Complex Number:**
   A complex number is typically written in the form $$ a + bi $$, where $$ a $$ is the real part and $$ b $$ is the imaginary part. In this case, the expression $$ -i\sqrt{23} $$ can be written as:
   $$
   0 - i\sqrt{23} \quad \text{or simply} \quad -i\sqrt{23}
   $$

**Final Answer:**
$$
-\,i\,\sqrt{23}
$$
$$ -\,i\,\sqrt{23} $$

Use the imaginary number \( i \) to rewrite the expression below as a complex number. Simplify all radicals. \[ -\sqrt{-23} \]

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