You are Here: Home >< Maths

MathsWatch marking answers as wrong when they are clearly correct watch

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

Related university courses

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: July 14, 2018
Today on TSR

Thought he was 19... really he's 14

University open days

Wed, 25 Jul '18
2. University of Buckingham
Wed, 25 Jul '18
3. Bournemouth University
Wed, 1 Aug '18
Poll
Useful resources

Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

How to use LaTex

Writing equations the easy way

Study habits of A* students

Top tips from students who have already aced their exams

Chat with other maths applicants