What are the solutions to the equion

plz answer right no it is 14

For this case we have the following equation:
 
 What we must do for this case is to clear the value of x.
 To do this, remember that when clearing you have two solutions.
 A solution is positive.
 A solution is negative.
 We have then:
 
 Therefore, the solutions are:
 
 
 the solutions to the equation are:
 

3cm and 6 and 9 cm that a possibility of that question