The function given is $f(x) = -2x - 5$. You are asked to find $f(-1)$.

To do this, substitute $x = -1$ into the function:

$f(-1) = -2(-1) - 5$

Simplifying this:

$f(-1) = 2 - 5 = -3$

So, $f(-1) = -3$.

Would you like further details or have any other questions?

Here are 5 related questions to explore:

1. What is the general form of a linear function?
2. How would you find $f(2)$ for the same function?
3. How do you interpret the slope and intercept in the function $f(x) = -2x - 5$?
4. How can you graph $f(x) = -2x - 5$?
5. What happens if $f(x) = 0$? How do you solve for $x$?

Tip: When evaluating a function, always ensure you're correctly substituting the input value into the expression and simplifying properly!