How do I put 73 in simplest radical form?

Look for perfect squares that divide into 73:

The first few perfect squares are :

##2^2=4## Does not go into ##73## without remainder

##3^2=9## Does not go into ##73## without remainder

##4^2=16## is even, we already checked 4 doesn't go in evenly

##5^2 = 25## Does not go into ##73## without remainder

##6^2## is even

##7^2=49##

##9^2 = 81## is greater than ##73##

##73## is not divisible by a perfect square, so ##sqrt73## cannot be simplified.