Question 600761
Notice that 243 = 81*3 and that 81 is a perfect square. This is very important as we can simplify the square root of 81 to get 9. 


{{{sqrt(243)}}}



{{{sqrt(81*3)}}}



{{{sqrt(81)*sqrt(3)}}}



{{{9*sqrt(3)}}}



So {{{sqrt(243)=9*sqrt(3)}}}