Provide an Appropriate Response $\mathrm{a}<0$ And $\mathrm{b}<0$ , Then $\sqrt{\mathrm{a}} \cdot \sqrt{\mathrm{b}}=\sqrt{\mathrm{ab}}$

Provide an appropriate response.
-If $\mathrm{a}<0$ and $\mathrm{b}<0$ , then $\sqrt{\mathrm{a}} \cdot \sqrt{\mathrm{b}}=\sqrt{\mathrm{ab}}$ .