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# S2 help Watch

1. https://57a324a1a586c5508d2813730734...%20Edexcel.pdf

can someone help me with 7c? ive tried drawing the rectangle but im getting nowhere
2. (Original post by imran_)
https://57a324a1a586c5508d2813730734...%20Edexcel.pdf

can someone help me with 7c? ive tried drawing the rectangle but im getting nowhere
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
3. (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?
4. (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.
5. (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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