Oh wow, I completely missed that there was another question on the previous page. I'll address your's soon.
Although, having said that,
Show that if a, b, c, d > 0, then:
a/b + b/c + c/a + d/a >or= 4
Just started doing advanced 3 unit inequalities and I have no idea what to do with this question, any help would be appreciated,
cheers.
This is actually one of the questions covered in my 4U notes book. So all I will do is put the working out here.
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Gonna just edit this post because there's no point making another one when I don't have a concrete answer.
The question I asked was from Fitzpatrick. The question above is also from this textbook. Do you know how to solve either of them. If so could you please show working because I am stumped.
Thanks
With that question you asked, the only logical thing to do is to somehow prove that \( ab+ac+bc\ge 3\sqrt[3]{a^2b^2c^2} \), because otherwise you aren't using the hence method. But to do that, you would have to make a
very weird substitution to force certain terms to collapse (in your given inequality), and right now I can't see how that works. I won't say that the question is nonsensical yet, but it seems extremely peculiar. (They actually make you prove something using a HORRIBLE method.)