Answer:
3[tex]\sqrt{7}[/tex]
Step-by-step explanation:
Using the rule of radicals
[tex]\sqrt{a}[/tex] × [tex]\sqrt{b}[/tex] = [tex]\sqrt{ab}[/tex] , then
[tex]\sqrt{63}[/tex]
= [tex]\sqrt{9(7)}[/tex]
= [tex]\sqrt{9}[/tex] × [tex]\sqrt{7}[/tex]
= 3[tex]\sqrt{7}[/tex]