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The expression you need to simplify is \( \sqrt{-25} - 4 \).

Let's break this down:

1. The square root of a negative number involves imaginary numbers. In this case, \( \sqrt{-25} = 5i \), where \( i \) is the imaginary unit, \( i = \sqrt{-1} \).
   
2. Now, simplify the expression: 
   \[
   \sqrt{-25} - 4 = 5i - 4
   \]

The correct answer is \( 5i - 4 \), which corresponds to option **C**.

Would you like more details or explanations?

Here are 5 related questions:
1. What is the square root of negative numbers called in complex number theory?
2. How would you simplify \( \sqrt{-9} - 3 \)?
3. What is the value of \( i^2 \) in imaginary numbers?
4. How do you add and subtract complex numbers?
5. Can a negative number have a real square root?

**Tip:** Always remember that the square root of a negative number involves the imaginary unit \( i \).

Learn how to simplify the expression √(-25) - 4 using complex numbers. This problem involves the imaginary unit 'i' and understanding the square root of negative numbers, suitable for high school students in grades 9-12.

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