1. The problem is to check the value of an expression or function at $x = -8.5$. 2. Since the user did not specify the exact expression or function, let's assume a general example: check the value of $f(x) = 2x + 3$ at $x = -8.5$. 3. Substitute $x = -8.5$ into the function: $$f(-8.5) = 2(-8.5) + 3$$ 4. Calculate the multiplication: $$2 \times (-8.5) = -17$$ 5. Add 3: $$-17 + 3 = -14$$ 6. Therefore, the value of the function at $x = -8.5$ is $-14$. 7. If you have a specific function or expression to check, please provide it for a precise evaluation.