Can't do this question please someone help

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The discussion revolves around solving a mathematical problem involving the expression S = 20a + 11(b+c) + 2d. The user successfully calculated part (A) with S=200 yielding a result of 22 but is struggling with part (B), specifically determining the values of S for which a square cannot be constructed. The user is uncertain whether the problem falls under precalculus or calculus, indicating a need for clarity in classification and methodology.

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Can't do this question :( please someone help

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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).
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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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I'm not sure whether I am on the right track, but ...

Code:
S = 20a + 11(b+c) +2d
  = 20a + 10(b+c) + b + c + 2d

So,  S - (2d + b + c) = 20a + 10(b + c)

Which can be interpreted as being a multiple of 10.
 

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