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I'm having real difficulty trying to understand shear force and bending moment diagrams - both cantilever beams and supported ones like below. I've given it my best shot to solve the reactions at the points and would greatly appreciate any help on how to form the diagram and the equations after using method of sections.

Thanks

1. The problem statement, all variables and given/known data

Create SFD and BFD of following beam.

2. Relevant equations

Fy=0

Fx=0

M=0

3. The attempt at a solution

Ma=0

-Rb(6) +30(4.5)+[(10x4.5)/3.75]-20=0

Rb=21.2kN

Mb=0

(30)(1.5)+[(10X4.5)/2.25]-20-6Ra=0

Ra=7.5kN

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# SFD & BMD of beam with point force through distributed load

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