Answer :
We will have the following:
[tex]\begin{gathered} \sqrt{x+3}\ast\sqrt{x-3}=\sqrt{(x+3)(x-3)} \\ \\ =\sqrt{x^2-9} \end{gathered}[/tex]We will have the following:
[tex]\begin{gathered} \sqrt{x+3}\ast\sqrt{x-3}=\sqrt{(x+3)(x-3)} \\ \\ =\sqrt{x^2-9} \end{gathered}[/tex]