To simplify \(-\sqrt{-36}\):
- First, recognize that \(-36\) can be expressed as \(-1 \times 36\).
- The square root of \(-36\) can be rewritten using the imaginary unit \(i\): \[ \sqrt{-36} = \sqrt{-1 \times 36} = \sqrt{-1} \times \sqrt{36} = i \times 6 = 6i \]
- Therefore, when you include the negative sign from the original expression: \[ -\sqrt{-36} = -6i \]
Thus, the simplified result is \(-6i\).