We are given the function $f(x) = 2x + 2$, and we need to find the value of $f(-1)$.

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

$f(-1) = 2(-1) + 2$ $f(-1) = -2 + 2$ $f(-1) = 0$

So, the value of $f(-1)$ is 0.

Would you like more details or have any questions?

Here are five related questions to expand on this concept:

1. What is $f(0)$ for the same function?
2. How do you determine if a function is linear based on its equation?
3. Can you find the slope and y-intercept of the function $f(x) = 2x + 2$?
4. What is $f(2)$ for the function $f(x) = 2x + 2$?
5. How would the function change if the equation was $f(x) = -2x + 2$?

Tip: Always remember, for any function $f(x) = mx + b$, where $m$ is the slope and $b$ is the y-intercept, you can quickly calculate any value by plugging in the desired $x$.