The expression \( Mn(m + n) \) can be simplified or explored depending on the values of \( M \), \( m \), and \( n \). 

### Expansion
If you want to expand it, distribute \( Mn \) across \( (m + n) \):
\[
Mn(m + n) = Mn \cdot m + Mn \cdot n = Mnm + Mn^2
\]

This results in:
\[
Mnm + Mn^2
\]

### Explanation
This expression represents the product of \( Mn \) with the sum \( (m + n) \). Expanding it as above gives two terms:
- \( Mnm \), which is the product of \( M \), \( n \), and \( m \),
- \( Mn^2 \), which is the product of \( M \), and \( n^2 \).

Would you like to proceed with a particular application, substitution, or further simplification of this expression?

Here are some related questions:
1. How does this expression change if \( m = n \)?
2. What if \( M \) is a function of \( m \) and \( n \)?
3. How would this expression be used in a polynomial equation?
4. Can you express this in terms of a specific value for \( M \), \( m \), and \( n \)?
5. How does expanding help in finding values quickly?

**Tip:** Always check if distributing terms or factoring can simplify or reveal patterns in expressions.

Explore how to simplify and expand the expression Mn(m + n) using the distributive property in algebra. Understand polynomial expansion with step-by-step explanations. Suitable for students in Grades 7-9.

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