An even function satisfies the property \( f(-x) = f(x) \) for all \( x \).
From the table, we have:
- \( f(-2) = 1 \)
- \( f(-1) = -2 \)
- \( f(0) = -3 \)
Using the property of even functions, we can find \( f(1) \):
Since \( f(-1) = -2 \), we have: \[ f(1) = f(-1) = -2 \]
Thus, the missing entry \( f(1) \) is \(-2\).
So the answer is: If \( f(x) \) is even, the missing entry is -2.