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# MathsWatch marking answers as wrong when they are clearly correct watch

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1. (Original post by carlafossil320)
let the consecitive odd no.s be 2n+1 and 2n+3
(2n+1)^2= 4n^2+4n+1
(2n+3)^2= 4n^2+12n+9
(2n+3)^2 - (2n+1)^2
=8n + 8
Factorises to 8(n+1)
any number multiplied by 8 is a multiple of 8
I will have a go and report back in 5 minutes. Thanks!
2. ok
3. (Original post by carlafossil320)
let the consecitive odd no.s be 2n+1 and 2n+3
(2n+1)^2= 4n^2+4n+1
(2n+3)^2= 4n^2+12n+9
(2n+3)^2 - (2n+1)^2
=8n + 8
Factorises to 8(n+1)
any number multiplied by 8 is a multiple of 8

4. no problem 😊
5. My homework average has increased to 99.2%, thanks everyone! Now I just need to find the errors in the grade 6 answers and the grade 9 answers
6. The next questions are on vectors and circle theorems - not my best topics. I have probably made a mistake on these ones.

Here is the rest of the working
PQ = 3/2p + q
CB = 2PQ
PQ and CB are scalar multiples, so they are parallel.
7. (Original post by Loci Pi)
My homework average has increased to 99.2%, thanks everyone! Now I just need to find the errors in the grade 6 answers and the grade 9 answers
I think it did not like the(2n - 1) because that could be negative if n = 0 [MathsWatch seems very fussy!)
8. (Original post by Muttley79)
I think it did not like the(2n - 1) because that could be negative if n = 0 [MathsWatch seems very fussy!)
Yes, it certainly is fussy. I dropped a mark yesterday because I put 1/2 instead of 0.5.
9. Has anyone found any mistakes in the vectors one?
10. (Original post by Loci Pi)
The next questions are on vectors and circle theorems - not my best topics. I have probably made a mistake on these ones.
Now you need to show one is the multiple of the other to show they are parallel - I'll check your vectors
11. (Original post by Muttley79)
Now you need to show one is the multiple of the other to show they are parallel - I'll check your vectors
I put this:
PQ = 3/2p + q
CB = 2PQ
PQ and CB are scalar multiples, so they are parallel.

But it is still incorrect according to MathsWatch.
12. (Original post by Loci Pi)
I put this:
PQ = 3/2p + q
CB = 2PQ
PQ and CB are scalar multiples, so they are parallel.

But it is still incorrect according to MathsWatch.
I suspect it's being fussy again.

PQ = q + 3p/2

CB = 2q + 3p = 2 (q + 3p/2)

then what you've written - it may not like the 3/2p ... (3/2)p is better or 3p/2
13. It would frustrate me no end if I had to do maths homework on MathsWatch back when I was a student.

For now, teacher marked work >> AI marked work so teachers can keep their jobs
14. (Original post by Muttley79)
I suspect it's being fussy again.

PQ = q + 3p/2

CB = 2q + 3p = 2 (q + 3p/2)

then what you've written - it may not like the 3/2p ... (3/2)p is better or 3p/2

Now on to circle theorems (probably my worst topic).

15. Spotting mistakes on mathswatch has been much better revision for tomorrow's mock exam than anything out of a textbook lol

Thanks everyone
16. I've been on mathswatch for 4 consecutive hours. I'd better get a 9 in the mock tomorrow lol.
17. (Original post by Loci Pi)

Spotting mistakes on mathswatch has been much better revision for tomorrow's mock exam than anything out of a textbook lol

Thanks everyone
You've misspelt segment ... second statement not needed?
18. (Original post by Muttley79)
You've misspelt segment ...
Thanks. I corrected it and it now says I have 2/3 marks.
19. (Original post by Notnek)
Also, please post maths questions in the maths forum in future
Seems like it's more of a "how do I insert maths according to semi-arbitrary notation rules" question than maths, judging from the above... why would teachers impose this tediousness on students?
20. (Original post by Loci Pi)
Thanks. I corrected it and it now says I have 2/3 marks.
Try deleting the second statment

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