The expression is:

$(-2) - 8$

To solve this, you simply subtract 8 from -2:

$-2 - 8 = -10$

So, the answer is:

$\boxed{-10}$

Would you like more details or have any questions? Here are some related questions to explore:

1. What is the result of adding two negative numbers?
2. How does subtracting a positive number from a negative number affect the result?
3. What is the absolute value of -10?
4. How can negative numbers be represented on a number line?
5. How do you solve expressions with multiple negative signs?

Tip: When subtracting a larger number from a smaller one, the result is always negative.