Hello,

A non prismatic figure / beam I need to derive a formula for b (x).

See the picture in the link below:

https://myalbum.com/album/Qs5BcjTUrEdt

The beam has a varying cross-section.

It is given that the dimensions at the end of the beam is determined by the relationship:

b (l) = αb (0), with α less than or equal to 1.

asked:

lead a formula for the dimension b (x) at a distance x from the left bearing.

My book gives answers:

b(x) =b(l) + ((l-x)/l)* (b(0)-b(l))

I self must step by step showthe derivation of the function.

How do I do that ?