Typically, a quorum must be maintained throughout the meeting for any resolutions to be valid. If a director leaves the meeting and the number of directors present falls below the required quorum, any decisions or resolutions made after that point may not be considered valid.
In this case, since Mr. Sarpong left the meeting and only two directors remained, the meeting may not have had a valid quorum for passing the resolution to expand the company's product line. It is recommended that the organization consult its regulations or bylaws, as well as seeking legal advice to determine the validity of the resolution and the appropriate course of action.