Question

$3.\sqrt{3}+\sqrt{3} -\sqrt[4]{729} =$

Answer 1

$3\sqrt{3}+\sqrt{3}-\sqrt[4]{729}\\3\sqrt{3}+\sqrt{3}-3\sqrt[4]{9}\\3\sqrt{3}+\sqrt{3}-3\sqrt[4]{3^2}\\3\sqrt{3}+\sqrt{3}-3\sqrt{3}\\\sqrt{3}$