Respuesta :
Answer:
Step-by-step explanation:I don't say you have to mark my ans as brainliest but my friend if it has helped you don't forget to tjank me...

[tex](\sqrt{6} + \sqrt{3})(\sqrt{6} - \sqrt{3}) = 6 -\sqrt{3} \sqrt{6} + \sqrt{3} \sqrt{6} - 3 = 6 - 3 = 3[/tex]