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S2 help

https://57a324a1a586c5508d2813730734691051ac35fd.googledrive.com/host/0B1ZiqBksUHNYZ3M4QzJ0N19IeHc/June%202014%20(R)%20QP%20-%20S2%20Edexcel.pdf

can someone help me with 7c? ive tried drawing the rectangle but im getting nowhere
Original post by imran_


Ive done this q

Basically how i saw it was that length of one side was x and the other side (9-x) and so the area R was x(9-x) =9x- (x^2) so A=-1 and B=9
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Original post by TheSammy2010
Ive done this q

Basically how i saw it was that length of one side was x and the other side (9-x) and so the area R was x(9-x) =9x- (x^2) so A=-1 and B=9


why was it 9-x?
Original post by imran_
why was it 9-x?


Because two sides are made up of two pieces of string formed by cutting a piece of length 9 into two. So, one has length x, and the other 9-x.
Original post by imran_
why was it 9-x?


The total length is 9 and a set distance which is a variable is given x, and since both lengths of string need to add up to the total, it much be (9-x). It works mathematicallu. x + 9-x = 9

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