Inequality Proof - Fraction Sum (3 of 3: Applying calculus)

[tonysonglalala]

Hope I had a math teacher like him: from an inequation to its curve, not just verify it, but also catch the intention to set this question.

[owenavila]

Thank you for making such great videos 👍

[yatpansze]

I am one of your big fans in Sydney. Could you please give me the right answer to this question ? Seems my answer is different from the teacher's.
X - 13 *6 + 3 = 111 Solve it using inverse operation.
Mine is 186. The teacher's answer is 31. Thanks.

[jursamaj]

If calculating the slopes at 2 & 4 was sufficient to characterize the curve, then the fact that the curve goes up to both asymptotes already took care of that.

[youssefwahba]

Why not use the AM GM inequality? Or is Eddie trying to prove it using calculus only?

[rodicabrudea]

one problem: I have no (more) idea on how to prove the function is continuous. thanks

[aubrey]

What program is he using to write this on a tablet?