investigate
Definitions
To carry out a systematic or formal inquiry to discover and examine the facts of an incident or allegation.
To conduct research or study into a subject or problem in order to discover new information.
Examples
The police will investigate the cause of the accident to determine who was at fault.
Scientists continue to investigate the long-term effects of climate change on coastal ecosystems.
I need to investigate why the computer keeps crashing every time I open that application.