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    I am stuck in this part from last 30 mins .I am not getting this equ (high lighted)
    I got 500x^2 -3776 x +5165

    here is my working
    1296(10-x/20)=100x^2 -820x +1681
    648-324/5x=100x^2-820x+1681
    100x^2 -3776/5x^2 +1033=0
    500x^2 -3776x+5165
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    (Original post by Qer)
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    I am stuck in this part from last 30 mins .I am not getting this equ (high lighted)
    I got 500x^2 -3776 x +5165


    here is my working
    1296(10-x/20)=100x^2 -820x +1681
    648-324/5x=100x^2-820x+1681
    100x^2 -3776/5x^2 +1033=0
    500x^2 -3776x+5165
    How did you go from the first line to the second? Might wanna double check that.
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    (Original post by Radioactivedecay)
    How did you go from the first line to the second? Might wanna double check that.
    1296((10-x)/20)=100x^2 -820x +1681
    648-324/5x=100x^2-820x+1681

    1296 Multiply 1/20(10-x) =324/5

    324/5 multiply (10-x) = 648 -324/5 x
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    (Original post by Qer)
    1296((10-x)/20)=100x^2 -820x +1681
    648-324/5x=100x^2-820x+1681

    1296 Multiply 1/20(10-x) =324/5

    324/5 multiply (10-x) = 648 -324/5 x
    I dont see how you went from 1296((10-x)/20) to 648-324/5x. You went from having the x on top to having it on the bottom??
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    (Original post by Radioactivedecay)
    I dont see how you went from 1296((10-x)/20) to 648-324/5x. You went from having the x on top to having it on the bottom??
    nope, it is still on the top.
    648 -(324/5)x


    that was a typing error
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    (Original post by Qer)
    nope, it is still on the top.
    648 -(324/5)x


    that was a typing error
    In that case, your simplifying is correct. You must have made an error earlier.
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    (Original post by Radioactivedecay)
    In that case, your simplifying is correct. You must have made an error earlier.
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    I got exactly that equ but when i simplify it I got a different answer, up to that equ all my working is 100%perfect.....
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    (Original post by Qer)
    Name:  Capture.PNG
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    I got exactly that equ but when i simplify it I got a different answer, up to that equ all my working is 100%perfect.....
    Yeah your working is fine. Mark scheme is definetely wrong here, they expanded wrong.
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    (Original post by Radioactivedecay)
    Yeah your working is fine. Mark scheme is definetely wrong here, they expanded wrong.
    yeah I think so
    thanks for help
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    On the first line of the printed working, it looks as though "36" should actually be "18", i.e. 6 x 3.
 
 
 
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