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# simplify equ -C4 watch

1. Will post in a min

2. 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
3. (Original post by Qer)

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.
4. (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
5. (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??
6. (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
7. (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.
8. (Original post by Radioactivedecay)
In that case, your simplifying is correct. You must have made an error earlier.

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.....
9. (Original post by Qer)

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.
10. (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
11. 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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