Determine maximum bending stresses

Constructing the moment diagram

Considering the segment
from x = 2 m to x = 3 m

     area under
                shear =  -22.00 kN-m
     concentrated
           moments =   0.00 kN-m
     total bending
            moment =  -22.00 kN-m

       at x = 2 m,     M =    +12.00 kN-m
           total bending
               moment   =   -22.00 kN-m
       at x = 3 m,      M =   -10.00 kN-m