Let's solve the expression step by step:

\[
- \left| (-1) + 3 \right|
\]

1. Start by simplifying inside the absolute value:
   \[
   (-1) + 3 = 2
   \]

2. Now, apply the absolute value:
   \[
   |2| = 2
   \]

3. Finally, apply the negative sign outside the absolute value:
   \[
   -2
   \]

So, the result of the expression \( - \left| (-1) + 3 \right| \) is \(-2\).

Would you like more details or have any questions?

Here are 5 related questions for practice:
1. What is the result of \( - \left| (-4) + 6 \right| \)?
2. Solve \( \left| (-2) - 5 \right| \).
3. What is \( \left| (-3) + (-7) \right| \)?
4. Simplify \( - \left| 3 - (-2) \right| \).
5. Calculate \( - \left| (-5) + 8 \right| \).

**Tip:** Always simplify the expression inside the absolute value before applying the absolute value operation.

Learn how to simplify the expression −∣(−1)+3∣ step by step, involving absolute value and basic arithmetic concepts. This example is perfect for students in Grades 6-8 and includes a detailed explanation and related practice problems.

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