Question 299569
{{{sqrt(45)+sqrt(5)=sqrt(9*5)+sqrt(5)=sqrt(9)*sqrt(5)+sqrt(5)=3*sqrt(5)+sqrt(5)=4*sqrt(5)}}}


Note: Recall that {{{sqrt(x*y)=sqrt(x)*sqrt(y)}}}


So {{{sqrt(45)+sqrt(5)=4*sqrt(5)}}}