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# Maths GCSE question watch

1. hey, i’m currently stuck on this question and wondered if anyone could help. Thanks in advance. Attachment 730438
2. I think...
a: 2b
b: -a b
c: -a-b
3. (Original post by aaminah03)
I think...
a: 2b
b: -a b
c: -a-b
b) should be b-a (you missed the addition sign)

It is important that you understood how he got these answers. Do you? Or do you need an explanation?
4. (Original post by Y11_Maths)
b) should be b-a (you missed the addition sign)

It is important that you understood how he got these answers. Do you? Or do you need an explanation?
Thanks for the help. Could I have an explanation please?
5. (Original post by Y11_Maths)
b) should be b-a (you missed the addition sign)

It is important that you understood how he got these answers. Do you? Or do you need an explanation?
Sorry, yh I missed the addition sign.
I don’t think u need an explanation as they are only worth 1 mark
6. (Original post by aaminah03)
I think...
a: 2b
b: -a b
c: -a-b
Thank you
7. (Original post by Ns8899)
Thank you
No problem 👍🏼
8. (Original post by Ns8899)
Thanks for the help. Could I have an explanation please?
For the first question it want the vector of the straight line from D to B. This will be equal to 2 lots of b (2b) since half of the line is b.

Question 2 to go from A to B, start at point A, you have to go opposite the vector of a so this will be -a then you have to add the vector of b to get to your finish point B. So this will be -a+b or b-a.

Question 3, since you know that the vector DO is b, starting from point A you need to go -a to get to the centre then -b to get to your finish point, hence -a-b.
9. (Original post by aaminah03)
Sorry, yh I missed the addition sign.
I don’t think u need an explanation as they are only worth 1 mark
An explanation of how it’s done so he understands it for future vector questions
10. (Original post by Y11_Maths)
An explanation of how it’s done so he understands it for future vector questions
Ok 🙂👍🏼
11. (Original post by Y11_Maths)
For the first question it want the vector of the straight line from D to B. This will be equal to 2 lots of b (2b) since half of the line is b.

Question 2 to go from A to B, start at point A, you have to go opposite the vector of a so this will be -a then you have to add the vector of b to get to your finish point B. So this will be -a+b or b-a.

Question 3, since you know that the vector DO is b, starting from point A you need to go -a to get to the centre then -b to get to your finish point, hence -a-b.
Thank you

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Updated: March 11, 2018
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