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The expression you've provided is:

\[
(-9a^2b) - (+8a^2b)
\]

Let's simplify it:

1. Combine the like terms, which both contain \( a^2b \):
   \[
   -9a^2b - 8a^2b = (-9 - 8)a^2b = -17a^2b
   \]

So, the simplified expression is:

\[
-17a^2b
\]

Would you like more details or explanations?

Here are some related questions to explore:
1. What are like terms in algebra, and how do you identify them?
2. How do you factor expressions with similar terms like \( a^2b \)?
3. What are common mistakes to avoid when simplifying algebraic expressions?
4. How would you simplify expressions involving different powers, such as \( a^2 \) and \( a^3 \)?
5. How can you expand this process to work with more complex polynomial expressions?

**Tip**: Always ensure that terms are combined only if they are like terms, meaning they have the same variables raised to the same powers.

Learn how to simplify the algebraic expression (-9a²b) - (+8a²b) by combining like terms. This problem involves algebraic concepts like simplification and handling like terms. Suitable for students in Grades 7-9.

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