Question 49828
  
  No negative number can be a perfect square.  Hence, square root of -225 can not be evaluated.  Because, if the square root is negative or positive, then its square has got to be positive.  But in no way a square can be negative.
  But {{{sqrt(-225)}}} can be at the most written as {{{5sqrt(-9)}}} as it is equal to {{{sqrt(-9*25)}}}.