1. The segment LO bisects one of the angles of the triangle shown in the figure attached, and divide the segment NM in two segments: NO and OM. Therefore, you must apply the Triangle Angle Bisector Theorem, which is shown below:
LN/LM=NO/OM
LN=10 LM=18 NO=4 OM=x (The value you want to find)
2. When you substitute this values in LN/LM=NO/OM, you have: