Edexcel C2 2016 Q9 Differentiation modelling

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Edexcel C2 2016 Q9 Differentiation modelling - a solution

A very convoluted question - several terms for area AND perimeter.
But 6 marks for these first two parts of the question
BUT
the MS is a little stingy IMO, for only 5 marks to find MinP - possibly 6
& yes, it would often be 4 marks for this bit of a question, but still ...
  1. A Level Maths
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Автор

Part d was done incorrectly, you've written the working right but you put into the calculator wrong. The answer should round to 120m

kaitlindunsterville