To factor the quadratic expression completely, first look for a common factor in all the terms. Then, factor the quadratic expression using techniques such as grouping or the quadratic formula if necessary.
Step 1: Identify the Expression
We start with the quadratic expression:
\[
-2x^2 - 16x - 24
\]
Step 2: Factor Out the Common Factor
First, we notice that each term in the expression has a common factor of \(-2\). We factor this out:
\[
-2(x^2 + 8x + 12)
\]
Step 3: Factor the Quadratic Expression
Next, we need to factor the quadratic expression \(x^2 + 8x + 12\). We look for two numbers that multiply to \(12\) and add to \(8\). The numbers \(2\) and \(6\) satisfy these conditions. Thus, we can factor the quadratic as:
\[
x^2 + 8x + 12 = (x + 2)(x + 6)
\]
Step 4: Combine the Factors
Now, substituting back into our expression, we have:
\[
-2(x + 2)(x + 6)
\]
Final Answer
The completely factored form of the expression is:
\[
\boxed{-2(x + 2)(x + 6)}
\]