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This solution evaluates whether a specific improper integral converges or diverges by employing the Comparison Test. It is established that for ( x geq 3 ), ( ln x leq x ln x ). Previous work demonstrated that the improper integral diverges when assessed in Example 4.9.7 (5). Based on the Comparison Test principles, it is concluded that if a larger improper integral is confirmed to diverge, the subject integral must also exhibit divergence.
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Example 1 Determine whether the improper integral converges or diverges. Solution Since ln x xln x for x 3, it follows that for x 3. In Example 4.9.7 (5), we showed the improper integral diverges. By the Comparison Test, the larger improper integral must also diverge.