Grades 11-12 Video Solutions 2021-video 2021 11-12/2

video 2021 11-12/2

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The problem involves finding integers in the open interval from \(20 - \sqrt{21}\) to \(20 + \sqrt{21}\). Estimating \(\sqrt{21}\) as between 4 and 5, the interval spans from approximately 15 to 25. Therefore, the integers within this interval are 16, 17, 18, 19, 20, 21, 22, 23, and 24. The total number of integers is 9.