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Let's evaluate the given expressions.

### 1. \(-\sqrt{100}\)
- The square root of \(100\) is \(10\), so:
  \[
  -\sqrt{100} = -10
  \]

### 2. \(-\sqrt{-144}\)
- The square root of \(-144\) involves an imaginary number, since the square root of a negative number is not a real number.
- Therefore, \(\sqrt{-144}\) is \(12i\) (where \(i\) is the imaginary unit), and:
  \[
  -\sqrt{-144} = -12i
  \]

Since the second expression results in an imaginary number, it is **"Not a real number."**

Do you want further details or explanations on these calculations?

Here are 5 related questions you could explore:
1. How do you simplify the square root of a negative number?
2. What is the value of \(i^2\) in complex numbers?
3. How do real and imaginary numbers differ?
4. Can negative numbers ever have real square roots?
5. How do you solve equations involving imaginary numbers?

**Tip:** When you encounter square roots of negative numbers, remember they involve imaginary units (\(i\)), where \(i = \sqrt{-1}\).

Learn how to evaluate square roots of both positive and negative numbers. This problem addresses the concept of square roots and introduces imaginary numbers in the context of complex number theory. Suitable for students in Grades 8-10.

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