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# A-Level Maths C2 - Coordinate Geometry watch

1. Hi guys!!

I just have a quick question regarding the equation of circles!

Attachment 718878

As you can see above, do I have to simplify (root 5) squared and write is as 5 or can I leave it like that and still get the full marks??

2. you should write it as a 5
3. yes you need to simplify because the standard equation of a circle doesn't equal a root.
4. Thanks you and would I lose marks if I don’t??

Also, in some questions where they ask to find the equation of the line and the question doesn’t specify what form in, would it matter if it’s in ax+by=0 or y=mx+c? If you don’t mind me asking, of course. Thank you
5. Thank you so much guys!!
6. (Original post by Newshsnik)
Thanks you and would I lose marks if I don’t??

Also, in some questions where they ask to find the equation of the line and the question doesn’t specify what form in, would it matter if it’s in ax+by=0 or y=mx+c? If you don’t mind me asking, of course. Thank you
You would lose the a1 accuracy mark.

I use the rule of thumb that if x is negative then I'll move it to the LHS to make it positive. I don't know if this is necessary, it's just how I do it.
7. Okay thank youu
8. (Original post by Newshsnik)
Hi guys!!

I just have a quick question regarding the equation of circles!

As you can see above, do I have to simplify (root 5) squared and write is as 5 or can I leave it like that and still get the full marks??

Either answer would be accepted, but you should aim to write expressions in their simplest form possible.
As for the lines, any form will be accepted as long as it's the correct one.

I'm no examiner, but generally in maths it doesn't matter that much unless a question specifies which form it wants the answer in.
9. (Original post by Newshsnik)
Hi guys!!

I just have a quick question regarding the equation of circles!

Attachment 718878

As you can see above, do I have to simplify (root 5) squared and write is as 5 or can I leave it like that and still get the full marks??

Simplify as much as you can, but not too much
10. Thank youu so much.

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