Question

caderno de atividades positivo on página 39

Answer 1

$x= \sqrt{21+\sqrt{13+\sqrt{7+\sqrt{4}}}\\}}} \\\\ x= \sqrt{21+\sqrt{13+\sqrt{7+2}}}}} \\ x= \sqrt{21+\sqrt{13+\sqrt{9}}}}\\\\ x= \sqrt{21+\sqrt{13+3}}}\\\\ x= \sqrt{21+4}}}\\\\ x=\sqrt{25}\\\\ x=5$