4ab+13bc

Solution:
1. Given expression:
* 4ab + 13bc

2. Analyze the terms:
* The expression has two terms: 4ab and 13bc.
* These terms cannot be combined further as they do not have common variables.

3. Factorization (if possible):
* Neither term can be factored further in a meaningful way due to lack of common factors besides 'b'.

4. The final factored form, taking 'b' common gives:
* b(4a + 13c)

Since the original problem does not necessitate a specific operation, the expression in simplest form is:
4ab + 13bc = b(4a + 13c).