Consider the following expression:

Let's simplify the expression step by step:

1. Start by calculating the first part:
\[
4 + (-6) \cdot 2.
\]
Here, we multiply \(-6\) by \(2\):
\[
-6 \cdot 2 = -12.
\]
Now, add \(4\) to \(-12\):
\[
4 + (-12) = 4 - 12 = -8.
\]

2. Next, simplify the second part:
\[
-(-3)^2.
\]
First, we calculate \((-3)^2\):
\[
(-3) \cdot (-3) = 9.
\]
Now, we apply the negative sign in front:
\[
-9.
\]

Now we can represent the entire expression:
\[
-8 \quad \text{ and } \quad -9.
\]

If these are part of a fraction (assuming based on your question that you might be looking for a denominator), the denominator is \(-9\).

So the simplified denominator is:
\[
\boxed{-9}.
\]