căn bậc hai(x) - căn bậc hai(x-1) - căn bậc hai(x-4) + căn bậc hai(x+9) = 0

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III. Every year many people in the world learn English. Some of them are young children. (1) _____ are teenagers. Many are adults. Some learn at school, and some learn in evening classes. A few learn English by (2) _____ or just by (3) _____ to the language on television or among their friends. Most people must work hard to learn English. (4) _____ do all these people want to learn English? It is difficult to answer that question. Young children learn English at school to study better at their subject. Many adults learn English because (5) _____ useful for their work. Teenagers often learn English for their (6) _____ studies, because some of their books are written (7) _____ English at their college or university. Other people learn English because they want to read English newspaper or magazine for (8) _____ and entertainment. IV. One of the main sources for the spreading of news and events throughout the world (1) _____ the newspaper. The purpose of newspapers is (2) _____ inform the public of political, social economic and entertainment happenings, among other things. Generally, there are three types of (3) _____: daily newspapers, weekly newspapers, and special-interest newspapers. Daily newspapers (4) _____ at least one edition every weekday. Most dailies also have a weekend (5) _____ Daily newspapers often have sections for news, sports, arts and entertainment, business and classified advertising. Weekly newspapers print once a (6) _____ and cover news of interest to readers in a smaller area than that of a daily paper. They focus (7) _____ local happenings rather than national or international events. Special-interest newspapers may publish daily, (8) _____, monthly, or even less frequently. They generally disseminate news of interest to a particular group of readers or feature news about a specific topic. Thanks to the (9) _____ of the Internet, we can now get access to electronic newspapers. To some extent, e-newspapers are cheap, up-to-date, and convenient for most (10) _____ in the world.