Resposta :
[tex]\large\boxed{\begin{array}{l}\rm\sqrt{vn+3}=3\\\rm \sqrt{vn+3}^2=3^2\\\rm vn+3=9\\\rm vn=9-3\\\rm vn=6\\\huge\boxed{\boxed{\boxed{\boxed{\rm\dagger\red{\maltese}~\blue{alternativa~D}}}}}\end{array}}[/tex]
Boa Madrugada
[tex] \sqrt{vn + 3} [/tex]
[tex] \sqrt{6 + 3} [/tex]
[tex] \sqrt{9} [/tex]