Resposta:
[tex]\textsf{Leia abaixo}[/tex]
Explicação passo a passo:
[tex]\Large \boxed{\begin{array}{I}\\(9\sqrt{7} + 2\sqrt{3})\:.\:2\sqrt{7}\\\\\sf{18\sqrt{7}\:.\:\sqrt{7} + 4\sqrt{3}\:.\:\sqrt{7}\\\\\sf{18\:.\:7} + 4\sqrt{21}\\\\\sf{126 + 4\sqrt{21}}\\\\}\end{array}}[/tex]
