Provide an Appropriate Response $\sqrt{\mathrm{x}^{2}-36}=\sqrt{\mathrm{x}^{2}}-\sqrt{36}=\mathrm{x}-6$

Essay

Provide an appropriate response.
-Explain the error in the following: $\sqrt{\mathrm{x}^{2}-36}=\sqrt{\mathrm{x}^{2}}-\sqrt{36}=\mathrm{x}-6$ .