Question 351721
Hints: 


Use the identities {{{sqrt(x/y)=sqrt(x)/sqrt(y)}}} and {{{sqrt(xy)=sqrt(x)*sqrt(y)}}}



Also...


{{{sqrt(8)=sqrt(4*2)=sqrt(4)*sqrt(2)=2*sqrt(2)}}} which means that {{{sqrt(8)=2*sqrt(2)}}}




{{{sqrt(a^9)=sqrt((a^4)^2*a)=sqrt((a^4)^2)*sqrt(a)=a^4*sqrt(2)}}} which means that {{{sqrt(a^9)=a^4*sqrt(2)}}}



{{{sqrt(b^3)=sqrt(b^2*b)=sqrt(b^2)*sqrt(b)=b*sqrt(b)}}} which means that {{{sqrt(b^3)=b*sqrt(b)}}}