Let's simplify the expression:

$8 - (2x + 9)$

Distribute the negative sign to both terms inside the parentheses:

$8 - 2x - 9$

Now, combine the constants (8 and -9):

$-2x - 1$

So, the simplified expression is:

$-2x - 1$

Would you like more details or have any other questions?

Here are 5 related questions:

1. How do you solve for $x$ in $-2x - 1 = 0$?
2. How do you factor an expression like $-2x - 1$?
3. What is the solution to $8 - (2x + 9) = 0$?
4. How can you apply this kind of simplification to a quadratic equation?
5. How does the distributive property work in equations like this?

Tip: When you encounter parentheses with a negative sign, remember to distribute the negative sign to each term inside the parentheses before simplifying.