(adsbygoogle = window.adsbygoogle || []).push({}); Can't do this question :( please someone help

I have managed to do part(A) and the answer I've got is 22 (when S=200). However, I'm stuck at part(B) at the moment. Here's what I've done so far for (B).

I don't know how to work out the values of S for which a square cannot be constructed. Any suggestion or advice please? Thanks!

NB: I'm not sure whether this question is classified as "precalculus" or "calculus" so if I've posted in the wrong place please let me know :)

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# Homework Help: Can't do this question please someone help

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