Solution - Simplification or other simple results

Step  1  :

 1.1     6 = 2•3

(6)² = (2•3)² = 2² • 3²

Equation at the end of step  1  :

Step  2  :

            -13
 Simplify   ———
            -21

Final result :

  13           
  —— = 0.61905 
  21