Answer
Assume $\overrightarrow{\rm BD}$ bisects $\angle$ABC. Then, the angles formed, $\angle$ABD and $\angle$DBC, would be congruent. But it is given that $\angle$ABD $\ncong$ $\angle$DBC, which leas to a contradiction. Thus, the assumption is false and it follows that $\overrightarrow{\rm BD}$ does not bisect $\angle$ABC.
Work Step by Step
Work cannot be shown for a proof. Logic is the only work done in such instances. Such work takes place mentally, and therefore cannot be shown.
