To find the value of \( a - 9 \) when \( a = 17 \), simply substitute 17 for \( a \) in the expression:

\[
a - 9 = 17 - 9 = 8
\]

So, the value of \( a - 9 \) is \( 8 \).

Would you like more details or have any further questions?

Here are 5 related questions to consider:
1. What is the value of \( a + 9 \) when \( a = 17 \)?
2. How do you solve \( a - b \) when \( a = 17 \) and \( b = 12 \)?
3. What happens to the expression \( a - 9 \) if \( a \) is negative?
4. How can you generalize the expression \( a - x \) for any value of \( a \) and \( x \)?
5. What would the result be for \( a \times 9 \) when \( a = 17 \)?

**Tip:** Always check the basic arithmetic of operations like addition and subtraction before moving to more complex expressions.

Discover how to find the value of the expression a - 9 when a = 17 in this straightforward arithmetic problem. This solution covers fundamental algebra and subtraction concepts, suitable for students in Grades 4-6.

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