Thank you for your response, it is difficult to explain in the these comments but i will try:- CD would be 1/3 of AD but we dont know AD we know AC and the ratio tells us that AC is twice CD (2:1) so if we know AC = 2x + 4Y then CD = x+2y So the whole of AD is AC+CD = 3x + 6y
If you are talking about the question that starts around 5m20s in (3rd one) then it is because they are not parts of the same line they are separate lines. So the whole of ZY is in the ratio of 3:2 with WX so ZY is infact 1.5 times WX. Often these vector questions with ratios are talking about parts of the same line where you would add the 3 and 2 to make 5 but because they are separate lines you don't do that for this question.
Really helpful I didint understand in school Here i fully understood , i printed sheets on vectors and practised im now confident to face any vector question
Mina s Thanks for you comment, this is a common question and I have answered it before, this is my response from before it is difficult to explain in the these comments but i will try:- CD would be 1/3 of AD but we dont know AD we know AC and the ratio tells us that AC is twice CD (2:1) so if we know AC = 2x + 4Y then CD = x+2y So the whole of AD is AC+CD = 3x + 6y
+The Night Regarding AC:CD is 2:1. AC=2/3(AD) which is represented by vector AC=2x+4y. It follows that CD=1/3(AD) which is represented by vector CD=1/2 of vector AC=1/2(2x+4y)=x+2y. Note: (1/3=1/2(2/3)). Another way to reason this ratio through is: 2/3 of AD represents 2x+4y. It follows that 1/3 of AD represents x+2y. Which means 3/3 or AD represents 3x+6y. So 3/3(AD) equals 2/3(AD)+1/3(AD) which represents 3x+6y= (2x+4y) + (x+2y) . Note: You knew vector AC and not vector AD (part of a whole). So, this sort of reasoning is needed in this case to calculate vector AD.
for the trapezium, in the first question, does it matter which direction you got to find mn? could i go right then up then left instead of left up then right? will it give me the same answer?
ua-cam.com/video/u1c58MseqDg/v-deo.html Hi All, I am Online Math tutor, Tutoring UK students for last 5 years, created a channel and started uploading math videos, planning to cover all topics, Pls click on the link and watch, Do subscribe and share if u like, more videos in making, comment for a particular topic of revision & previous papers to be explained, Thank you... ua-cam.com/video/u1c58MseqDg/v-deo.html
For the third question 'On a trapezium', why is vector ZY 3/2s and not 3/5s as the total of the ratio (3:2) is 5, so shouldn't 3 be written out of the total sum of the ratio??
Amber Karim the ratio is not for one length but for the two separate lengths WX and ZY (you add the ratio when you are trying to split one thing into a ratio, but this one is different). This is more like a question such as the ratio of Red:Blue is 3:2 if you have 2 Blue you must have 3 Red so if Blue is s then Red would be 1.5s
+Effie28 Because the question states the ZY : XY is in the ratio of 3:2 meaning ZY is 3 and XY is 2 - And to get from 2 to 3 you must multiple 2 by 1.5 or (3/2). WX is = to vector S and WX is 1.5 times shorter than ZY (As ZY is in the ratio of 3:2 to XY) so to get S to 3/2 you must multiple S by 3/2 to get '3/2S'
Thank you!! I was confused because usually with same line ratios you would do it 2/5 and 3/5 but thanks for explaining its just 3:2. Really helpful :) :)
Edward Walters omg! The exam was extremely hard! The answers were too wordy for proofs and too long! Not a fair exam at all. I was extremely disappointed! I have been practicing past papers and getting 90 plus raw score. I don't think I will manage to get even 70 for this exam. How was yours?
icecubeinferno yes but that question was very easy. I skipped it because I looked at the question in the last 2 minutes and there was not enough time to write. The answers were too long! 1 hour 45 minutes was not enough for this hard exam
Hitanshu Arora It was going fine until i hit Hannah's fucking sweets! :D then stress kicked in... by using an unofficial markscheme online where somebody wrote all the answers i worked out i probably got 77/8%. And I, too, hv been getting 92% and that on my past papers, including timed ones (i have done about 25-30 papers). So need to beast this calculator on Monday to get A*! They'd better lower the boundaries, or as my friend put it 'Rains of Castamere' will be playing in their marking halls... -_-
This video wasn't for teaching, he was just supplying us with practice questions essentially, then showing us the correct solutions once we'd paused and completed
His explanations are good and clear. If you are aiming A* or for 8+ then you are expected to know the stuff he is not explaining. Thats normal. A* and 8+ pupils are expected to think for themselves moreso. Brilliant video. Need more like em.
5 years and still saving lives , thanks
Make it 6.
Thank you for your response, it is difficult to explain in the these comments but i will try:-
CD would be 1/3 of AD but we dont know AD we know AC and the ratio tells us that AC is twice CD (2:1) so if we know AC = 2x + 4Y then CD = x+2y
So the whole of AD is AC+CD = 3x + 6y
Thank you so much! I've got my exam tomorrow and this has helped a lot as i didn't understand the proof :D
If you are talking about the question that starts around 5m20s in (3rd one) then it is because they are not parts of the same line they are separate lines. So the whole of ZY is in the ratio of 3:2 with WX so ZY is infact 1.5 times WX. Often these vector questions with ratios are talking about parts of the same line where you would add the 3 and 2 to make 5 but because they are separate lines you don't do that for this question.
This was incredibly helpful and I feel much more confident with vectors now.
Really helpful
I didint understand in school
Here i fully understood , i printed sheets on vectors and practised
im now confident to face any vector question
Thanks so much. Incredibly clear and helpful.
Thanks for your comment.
At 07:27 how do you work out -s +3/2 a
*3/2s
I watched all 31 minutes of the video and hope it helps for my exam
Explained it better than my maths teacher :)
I can't thank you enough for this video. Thank you so much sir!
at 4:50, isnt it supposed to be 1/3(2x+4y) ?
Mina s Thanks for you comment, this is a common question and I have answered it before, this is my response from before
it is difficult to explain in the these comments but i will try:-
CD would be 1/3 of AD but we dont know AD we know AC and the ratio tells us that AC is twice CD (2:1) so if we know AC = 2x + 4Y then CD = x+2y
So the whole of AD is AC+CD = 3x + 6y
RawMaths Thank you :)
CD is 1/3 of AD so 1/3(3x+6y)=x+2y . so basically ac is just double cd so u half ac.
correct
+The Night Regarding AC:CD is 2:1. AC=2/3(AD) which is represented by vector AC=2x+4y. It follows that CD=1/3(AD) which is represented by vector CD=1/2 of vector AC=1/2(2x+4y)=x+2y. Note: (1/3=1/2(2/3)).
Another way to reason this ratio through is: 2/3 of AD represents 2x+4y. It follows that 1/3 of AD represents x+2y. Which means 3/3 or AD represents 3x+6y. So 3/3(AD) equals 2/3(AD)+1/3(AD) which represents 3x+6y= (2x+4y) + (x+2y) . Note: You knew vector AC and not vector AD (part of a whole). So, this sort of reasoning is needed in this case to calculate vector AD.
This has helped me so much! I have been looking everywhere for a clear, simple vector video. THANKYOU!
Thanks for the comment it is great to get feedback and don't forget to spread the word to your friends ;)
On (24:33) you said OP is 3a but because its divided into 1/3 and 2/3 why isn't it just a?
Sorry Daniel cant reply to your comment but no a+b would be incorrect. Could it be that you didn't half the AB?
for the trapezium, in the first question, does it matter which direction you got to find mn? could i go right then up then left instead of left up then right? will it give me the same answer?
Auria Helen it would give you the same answer but it would be a lot harder to do. Just in case you’re still stuck after 3 years :)
at 16:45,,,,, where did 3 1/5b come from ??? o.o
21:34
I got: NR = 2PN
does different answers from different routes count or are they wrong?
ua-cam.com/video/u1c58MseqDg/v-deo.html
Hi All, I am Online Math tutor, Tutoring UK students for last 5 years, created a channel and started uploading math videos, planning to cover all topics, Pls click on the link and watch, Do subscribe and share if u like, more videos in making, comment for a particular topic of revision & previous papers to be explained, Thank you...
ua-cam.com/video/u1c58MseqDg/v-deo.html
This is really, really, really, really HELPFUL!!
Thank you for your hard work! :)
Thanks for the video. I have my GCSEs in a few weeks and this was the only topic that I didn't understand but now I do.
how did they go?
FANTASTIC. I didn't get it at all before this.
3:05 for question b: Can the answer be -a+b?
yes
Hi, at 8:54 shouldn't LU be 1/3U as its 1/4 of OU and not U
leah38521 Thxs for the comment but... as u = OU and OL is 3/4 of OU that means there is 1/4 left so 1/4u
RawMaths But u is not OU, Leah would be correct, you would take a third of u
Elliot Smith Hmm looks to me that it is says it is on the first line of the question
In the diagram OU = u
RawMaths Yep fair enough aha, great videos by the way
Thxs :)
For the third question 'On a trapezium', why is vector ZY 3/2s and not 3/5s as the total of the ratio (3:2) is 5, so shouldn't 3 be written out of the total sum of the ratio??
Amber Karim the ratio is not for one length but for the two separate lengths WX and ZY (you add the ratio when you are trying to split one thing into a ratio, but this one is different). This is more like a question such as the ratio of Red:Blue is 3:2 if you have 2 Blue you must have 3 Red so if Blue is s then Red would be 1.5s
Oh i think i get it now!! Thanks. :)
for the penultimate questions could you instead work out EF and DE and say that they both share common point E?
In 14:12 isn't vector RP= b-a ??
+Ahmed Hady Thxs for your question, but RP is the opposite direction of PR so all signs would be reversed. As PR = a+b RP = -a -b
+RawMaths Thank you very much for answering my question! :) I get it now ^_^ Thank you again!
How dod you get 2/3? For the trapezium one?
For part b) I got a+b instead of your b-a answer, would it still be right?
I worked it out and calculated PN is 2NR. Would this still get me the mark? (at 22:55)
Yes if you can show one is a multiple of the other and they share a common point then they are on a straight line.
Could you explain how -s + 3/2s is 1/2s? Thanks :)
Asam Sajid -s is like -1s and 3/2s = 1.5s so -1 + 1.5 = 0.5 so 0.5s or 1/2s
or you could say -s = -2/2s and so -2/2 + 3/2s = -2+3/2s= 1/2s
For the third example didn't you work out YX not XY?
Nope I think I laid it out clearly as i went from x to w and w to z and z to y that is the same as xy
Yeah I got it now. Thx for the great vid
thank you sir.you are better than all teachers in my school combined.I don't think I will fail any question from this topic
i hope not
in 9:22 why we donot say that LK=3/4u+v+1/3(-u+v) !!!!
I have the same question
did you get the ans after 3 years
on question 2 why is it not ⅓(2x + 4y) because 1+2 = 3
For the question at 6 minutes - how did you get 3/2?? :)
+Effie28 Because the question states the ZY : XY is in the ratio of 3:2 meaning ZY is 3 and XY is 2 - And to get from 2 to 3 you must multiple 2 by 1.5 or (3/2). WX is = to vector S and WX is 1.5 times shorter than ZY (As ZY is in the ratio of 3:2 to XY) so to get S to 3/2 you must multiple S by 3/2 to get '3/2S'
Thank you!! I was confused because usually with same line ratios you would do it 2/5 and 3/5 but thanks for explaining its just 3:2. Really helpful :) :)
+Effie28 Decent
nikhil saini what?
THANK YOU FOR MAKING THIS INFORMATIVE VIDEO SIR!!!
it helped me alot..
Thank you!!! this had been doing my head in untill now :)
Wow.. thank you so much, I never understood vectors before this. Thank you thank you thank you
A very conductive 31minutes. Thank you very much
thank you so much, this is very helpful
This is amazing and helpful! Thanks so much!
Sir you just made my day
Can't thank you enough. It was really helpful
I'm glad it was helpful good luck with exams.
thank you very much, i really appreciate your clear explanations and help :)
is this on the calculator paper?
thanks for the video, i got almost all correct:D
Elite Droid thank you for answering but since posting I have found out it's on the second calc one - unit 3, thanks anyways:)
This video was perfect to show the proof of straight and parallel lines! Have exam in few hours! Good luck to me! :)
Hitanshu Arora How did u find it? shame vectors didn't reveal themselves
Edward Walters omg! The exam was extremely hard! The answers were too wordy for proofs and too long! Not a fair exam at all. I was extremely disappointed! I have been practicing past papers and getting 90 plus raw score. I don't think I will manage to get even 70 for this exam. How was yours?
Was the exam the one with hanna's sweets question with the proof of ?
icecubeinferno yes but that question was very easy. I skipped it because I looked at the question in the last 2 minutes and there was not enough time to write. The answers were too long! 1 hour 45 minutes was not enough for this hard exam
Hitanshu Arora It was going fine until i hit Hannah's fucking sweets! :D then stress kicked in... by using an unofficial markscheme online where somebody wrote all the answers i worked out i probably got 77/8%. And I, too, hv been getting 92% and that on my past papers, including timed ones (i have done about 25-30 papers). So need to beast this calculator on Monday to get A*! They'd better lower the boundaries, or as my friend put it 'Rains of Castamere' will be playing in their marking halls... -_-
Thanks a lot for your guidance. It was very helpful for me
Why is it 3/2 and not 3/5 ?? :/
thank you very much, you save ma day I appreciate it thanks
Thank you hope it helps for my exam
Thank you this is awesome
the index is very useful
thank you so much!!!
THANK YOU !!!
literally watching this now
If I Get A* Star I Will Be Amazed
+Epic Tech Daniel XD me too I swear
A* is easy
What did you get
What did you get? I’m dying to know!!
Thank you
Hope it helped :)
RawMaths
Yes it helped me a lot to get a quick revision on IGCSE Further P.Maths Vectors....Thanks again and keep up your good work :)
question 2 is incorrect
thank you :)
thank u so muchh:)
Useful
I would’ve guessed 4!
you angel thank you
Having exam later thanks
good luck, if you're done, how did it go?
plz no facebook !!!! if I 'd like to ask some questions thnx in advance .
I can't simplify the fractions for the life of me
Lazar do you struggle with finding the common denominator?
30 minutes Long this ain’t East Enders you know
You do know you can stop and come back at any time?
RawMaths thanks for the tip. Really appreciate it. Helpful video.
Finger foot
leg bottom
I can't do this ;C
Cool
You don't explain properly you just do the calculations without explains it because you've memorised the answers and it's so annoying!
I'm sorry you feel that way. It does say at the start that this is not a teaching video but a revision tool.
This video wasn't for teaching, he was just supplying us with practice questions essentially, then showing us the correct solutions once we'd paused and completed
His explanations are good and clear. If you are aiming A* or for 8+ then you are expected to know the stuff he is not explaining. Thats normal. A* and 8+ pupils are expected to think for themselves moreso. Brilliant video. Need more like em.
u just got pranked bro!
if u know the basics
you'll understand
Thank you