To get from A to B you need to go back down a in the opposite direction which makes it negative then along OB in the correct direction which makes that positive b
+abodey abyad To be honest it doesn't matter if you used PR and QR so long as you can show one is a multiple of the other, as they share a common point R that would be enough to prove they are co-linear.
I presume you are talking about the first question. If OR was = b then BR would be 3/8b but as it is OB that = b then you need to divide by 5 and times by 8 to get OR which gives you 8/5b so BR is 3/5b
morning and good explanation most of the way there is an error on the last part of question 2 surely you mean PQ rather thsn PA is co linear to PR ??? since vector AP = 1/5 a multiples of this would have to be of a similar (2/5 a) for example Logically the lines PA and PR cannot be going in same direction otherwise proof is all good if i'm wrong then please correct me regards Martin
Thanks for spotting that, I think it is much earlier than that though I started calling PQ, PA in the first question. I have put an annotation in correcting the error, with a thank you note to yourself ;)
Thank you for your comment, it is always a difficult line I draw between the depth of explanation and the time it takes to get to the answer. The good thing about videos is you can replay them over and over.
This really helped the day before my maths exam
Great help, understand literally everything about Vectors now !!
Damola Fashina Thanks for the great feed back nice to know my videos are useful :)
To get from A to B you need to go back down a in the opposite direction which makes it negative then along OB in the correct direction which makes that positive b
In question one (b) why did you choose the two points PR and PQ Rather than PR and QR?how do I know what points should I choose? I'm confused!
+abodey abyad To be honest it doesn't matter if you used PR and QR so long as you can show one is a multiple of the other, as they share a common point R that would be enough to prove they are co-linear.
Thanks for this!!! Ur a great help.👍🏼
you are a savior! thanks man :)
No problem glad I could help :)
Thanks. I really appreciate it.
In the first question, why is AB -a + b when you are going in the same direction as a shouldn't a be positive and b be negative? Thabks for the video
wait why does PA mean P, Q and R are co linear on the second question? What does PA have to do with it?
+Rosa Armstrong There is a pop up comment how I made a mistake by referring to PA when I should have said PQ
love you man
why is BR 3/5b, i swear its supposed to be 3/8
I presume you are talking about the first question. If OR was = b then BR would be 3/8b but as it is OB that = b then you need to divide by 5 and times by 8 to get OR which gives you 8/5b so BR is 3/5b
Thanks that really helped
Gaailashwaran Piruthiviraj ;)
+RawMaths I still dont understand
morning and good explanation most of the way
there is an error on the last part of question 2
surely you mean PQ rather thsn PA is co linear to PR ???
since vector AP = 1/5 a multiples of this would have to be of a similar (2/5 a) for example
Logically the lines PA and PR cannot be going in same direction
otherwise proof is all good
if i'm wrong then please correct me
regards
Martin
Thanks for spotting that, I think it is much earlier than that though I started calling PQ, PA in the first question. I have put an annotation in correcting the error, with a thank you note to yourself ;)
Yea I noticed too
this is really confusing, he is mainly talking to himself throughout the working out and I get confused how he completes the question.
Explained poorly in a rush
you're too fast! didn't like this video
Thank you for your comment, it is always a difficult line I draw between the depth of explanation and the time it takes to get to the answer. The good thing about videos is you can replay them over and over.