Answer: Their primary goal is something other than providing unbiased facts.
Explanation: Expository writing is writing that aims to inform its reader. As we mentioned above, this includes all types of factual writing, like textbooks, news stories, technical guides, and pieces of business writing. Many journalistic pieces are pieces of expository writing, but not all are—advertorials, opinion pieces, and many pieces of political writing are not pieces of expository writing because their primary goal is something other than providing unbiased facts.