Express $$ -9 \sqrt{-16} $$ as a complex number (in terms of $$ i $$ ): $$ -9 \sqrt{-16}=\square $$

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To express $$ -9 \sqrt{-16} $$ as a complex number in terms of $$ i $$, follow these steps:

1. **Simplify the square root:**
   $$
   \sqrt{-16} = \sqrt{16 \times (-1)} = \sqrt{16} \times \sqrt{-1} = 4i
   $$
   
2. **Multiply by $$-9$$:**
   $$
   -9 \times 4i = -36i
   $$

So, the expression $$ -9 \sqrt{-16} $$ as a complex number is:

$$
-9 \sqrt{-16} = -36i
$$

**Answer:**

$$-36i$$
$$-36i$$

Express \( -9 \sqrt{-16} \) as a complex number (in terms of \( i \) ): \( -9 \sqrt{-16}=\square \)

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