(Section 2.8: Continuity) 2.8.19 If either fa1()or fb1is 0, then we have a zero off, and we can either stop or try to approximate another zero. If neither is 0, then we can take the midpoint of the search interval and find out what sign fis there (in red below). We can then shrink the search interval (in purple below) and repeat the process. (Figure 2.8.q) We repeat the process until we either find a zero, or until the search interval
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