Rearrange algebra formula to make n the subject - GCSE Question
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- Опубликовано: 16 окт 2024
- www.3minutemath....
This video is all about how to rearrange an algebra formula to change the subject to 'n' and forms part of the playlist 'How to rearrange or change the subject of a formula.'
This question is around grade B / A at GCSE and there are some similar practice questions on www.3minutemath.... In this problem we're asked to make n the subject of the formula K = (3n + 2)/n+1. The easiest way is to multiply both sides by n+1 and go from there.
I hope the video helps and please do leave a comment - thanks!
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Still have absolutely no idea why i need to know this, i might just join the French Foreign legion and fight South American drug lords for the rest of my life because I hate algebra.
Lol ... that's just made me laugh :-)
really nice video sir thank u
Kev T same
Kev T Damn man go to the tomb of Al khawarizmi Abu Al wafa buzani then it's in Arab and your problem will get solved.
Good call brother
You have just relieved about 70kilos of stress. Thank you good sir.
When the teacher teaches this subject for 5 lessons and this guy’s done it under 5 mins
*4:49
@@leonardodiserpierodavinci8016he says under five minutes that's under five minutes
your teacher obviously talks to himself
🤣🤣🤣🤣🤣lol
Thank you so much for this video,I was literally just stuck on my assignment so o searched and since your thumbnail was a similar question,I chose it and used the same method to solve mine,its so easy .
omg thank the lord the only video actually using all the circumstances THANK YOU GOD BLESS YOU BEAUTIFULPEOPLE :)
GOD BLESS YOU TOO❤
Clearly explained and easy to follow through. Thank you!
Dude, thank you sooooo much. The explanation is so simple and easy to understand. You explain much better than those teachers at school. Thanks a million.
Excellent video and you don’t skip steps..it really used to annoy me at school and elsewhere when the teacher assumed that you knew something and just skipped a step because he either didn’t know how to teach it or just to lazy. The trouble then is people like me with a particular difficulty with maths get totally lost because I try to understand in detail every step rather than just accepting the fact as true.
You just saved my grades, good sir.
(I’m revising for my end of year 8 tests)
That’s great and glad to help :-)
people 45 minutes of video on this topic where as he done less than 5 minutes you're truly awsome sir
Thanks Simon, this is indeed very helpful to me. In our school, instead of minusing thing, we move them to the other side and simply change the sign.
Glad to help and all best S :-)
It's not the easiest to comprehend but somewhere to start for clues. Thanks for sharing your knowledge.
Omg thank you so much never really understood this!
This video helped me soooo much! I needed to solve a 3 paged packed with these sort of questions. Thank u!
saved my life in gcse, saving my life in ib. Thank you 3minutemaths!
Glad to help, and all very best S :-)
My head is about to explode I’m only in year 7 and my maths teacher is giving me this. Sooooo hard
Ephraim Solomon year ten here with the same problem, it gets easier with practice
THANK YOU, FINALLY ANOTHER Y7 GOING THROUGH THE SAME THING. BROTHAS STICK TOGETHER. Have you also been watching The Organic Chemistry Tutor? cause if yes then same
The Burger Boss I am yr 7 to if u wanna do chem I recommend freesciencelessons it’s good cuz we yr7 need to stick together lol
Wondertrashy 07 sure and thanks
Year eleven trying to figure out how to solve for Change in time when (Change in X) is equal to the (Initial Velocity times Change in Time) plus (half the acceleration times Change in time squared)
You’ll forget what a number is in my grade.
I think there is another method when doing rearrangement u dont need multiply on both sides just simply drag the term from on side to another by changing the + or - sign but it is a very useful video . High-experienced and knowledgeable . 2 thumbs-up
when he says subtracting from both sides, it is the same as dragging it from one side to the other and changing the sign. basically it is the more mathematical way of looking at it.
as for multiplying, that it a different matter can't be done by dragging a term to the other side.
Thankyou so much sir, I wasn’t sure how to collect the like terms and you helped me!
That’s great and very glad to help - all best S 😀
Sur they way you explain is just amazing hope we get these type of teachers in India ❤
Very welcome and glad to help - all best S :-)
God bless you, sir. Tried to solve my problem for few hours, after your video I solved in minutes !!
stoopid
@@mgcpr0z372 😂
This helps me so much! I'll always come back when I forget how to do it.
*add to playlist*
Glad to help and all very best S
thank you so much sir oh my god i was stuck on a question for so long and you just saved me
Hi - that’s great and very glad to help. All best with your studies :-)
This was so bloody helpful Thank You
mate thanks so much ur video helped me in my homework and no other video on youtube helped me so thanks so much dude!!!
That's great and glad to help - all best with your studies :-)
how did your homework go?
Great video for a struggling year 9
I'm currently teaching myself maths in my spare time (misspent youth) and am at key stage 3 so far and learning this exact thing.
I got the question right and was shocked to hear it's a GCSE level question, I've always thought anything GCSE related was super difficult.
Anyway great video, confirmed I'm on the right track.
Hi - GCSE can get quite challenging and I've posted some 'new topic' videos. I hope they help and all very best with your studies :-)
Thanks man, needed to jog my memory on this :3
Glad to help and all best :-)
God bless you for making mathematics easier
Glad to help and all best S :-)
my test is tomorrow and this video really really helped thanks alot
That's great and hope your text goes well S :-)
my teacher can’t teach me this in 50 mins and you can in 5, saved my life
Thank you, Sir this video was very helpful and simple to understand
I have a math exam tomorrow and you saved my life!!!! :D
All best for your exam :-)
0:57 At this point you can also cross-multiply! multiply k with (n+1) and k has an invisible denominator 1 which will be multiplied with (3n+2). I find this easier to understand but do what works for you!
Hi - no worries and hope the video helped. All best S :-)
I am doing my maths exam this summer so I don't have to do the new syllabus (I am year 10). I always go to this channel if I can't remember how to do something. It's a great resource!
Thank you for posting these videos :)
+Bluestone Alley - Very welcome and glad to help, all best with your exams! :-)
Good luck! what grade did you get??
I got to a private school and this guy is teaching me stuff for free unlike my school who I’m paying 25 grand
At the end when you were suggesting different ways of writing it, the last one you wrote -(k -2), but the 2 is positive
Hi - yes, a negative x negative is positive so
-(k - 2) when you expand is -k + 2
Best S
thanks so much!!!!!! i’m studying and didn’t yet this, but now i do!! thanks so much :)))
Very useful, explained really well. Cheers
Glad to help and all best S :-)
I was literally gormless in my lesson but this has helped!!!!!!!!!!!!
i didnt understand before but now i do thank u!!!!!!!
Haha I'm having this "change the subject" test tomorrow.. I have prepared well Alhumdulillah but some of the questions in my textbook are just too darn HARD!!!
Haha this is late but did u do well?
Thanks for asking lol, I got f**king 20 out of 20! It was changing the subject with algebraic fractions and 1-2 more topics and I scored full marks! I guess hard work pays off in the end xd
EDIT : grammatical mistakes ;/
hey
AMAZING!! THANK YOU SO MUCH I understand everything now thankss againn!! 😩✨🤩
Thanks for the help
Thank you so much. This really helped.
Thanks. This helped a lot.
Thanks for the video Simon. Nice to hear a familiar accent, even though I was born and live again in Australia. We used to live (for 20 years) in Ashton u Lyne. I am at Uni studying to become a science teacher. I ony want to teach Agriculture, but such is the requirement. I am doing General Maths and not understanding Algebra as it was over 30 years since I was at high school.
I will check out you other videos. I was good with the changing the subject right up to the factorisation...LoL. Not sure why it's needed. My answer was different to yours, all good! :)
Glad to help and all very best with your studies :-)
Hi Simon, great video 👍, could you please explain why thr right hand side
n + 1 X (n + 1)
cancels out ?
I thought it would be n2 X 1n + 1n + 1
Hi - on the rhs you've got a denominator of (n+1) so I've multiplied by (n+1) to cancel out.
It's the same as something like
x/4
then multiplied by 4
will just leave x on its own
Best S
Honestly bless you!! Thank you so much!!
Really good video, thank you
HONESTLY really GOOd video.
You sound exactly like my neighbour, Chris😂
Mine too woah
Mine too woah
I didn’t think I’ll find you here Rebecca, but he really does sound like me!
Mine too woah
Mine too woah
test tomorrow this really helped
All best for the test! :-)
Did u pass?
@@rft9776 Bro that was 2 years ago..
Definitely helped.
this video is 4 minutes but it felt like a day
haha
Great vid dude
A video that's probably going to help me gets a like before I even know if it would be useful.
i'm curious to see a situation where this formula and a few others are applied thanks simon ps maybe at the end of the video move the paper up and down slowly so we can see the end result
This was very useful thank you!
Thanks sir got 19/20 on the test :)))
That’s great - congrats!
Proper mint. Cheers, hopefully I'll be getting that A* next year! :-)
Haha I'm having this "change the subject" test tomorrow.. I have prepared well Alhumdulillah but some of the questions in my textbook are just too darn HARD!!!!! I also want an A* .. I get like A in maths (85+/100)
You wont mate.
After expanding, if you subtract kn from both sides, then subtract 2 from both sides before factoring out the common term 'n', then dividing both sides by 3-k you end up with a different answer as below. This is clearly different to 2-k on the top, though the rules of rearranging seem to have been applied here correctly. Would you be able to explain please?
n =k−2/3-k
Hi - I think the difficulty is subtracting 2. The (3n + 2) / n + 1 is really the same as saying
(3n + 2) / n + 1 added to 2 / n + 1 ... it's the same as adding fractions with a common denominator.
You'd really need to get rid of the n+1 first.
Hope that's OK and all best S :-)
Thanks Simon. I checked by substituting with numbers and they both work out the same. Cheers
Ah, that's great and glad it got sorted :-)
Mine is very difficalt and I don't understand the question is rearrange Y=2x-1 divided by 4x+5 to make X the subject? Can you help? Make a video
Hi - hope this is OK:
y = (2x - 1) / 4x + 5
Multiply both sides by 4x + 5
y (4x + 5) = 2x - 1
Multiply out the brackets
4xy + 5y = 2x - 1
You then need to get the 'x' terms on one side and everything else on the other
4xy - 2x = -5y - 1
Factorise for x
x (4y - 2) = -5y - 1
Lastly divide through by 4y - 2
x = (-5y - 1) / 4y - 2
All best S
2:35 why does it not work to minus the 2 on both sides then divide everything by three?
I am still wondering the same thing
I know its a bit late but its because you want to collect all the subject terms on one side
Sir, would you mind telling me the make and brand of the pen you're using?
Hi - I think it's a Parker (had it for years - great pen if the people from Parker read this) :-)
This helped me soooo much. Tysm 🙏🏻
Is it possible to do this with numbers rather than letters? Are there any examples using numbers? Thanks
Hi - that would be standard fractions - here's a playlist that might help: ruclips.net/p/PLPglScc3TJ-Omf9JfCaNlYbDQmcltcP0S. Best S
Simon Deacon thank you so much.
Interesting enough, when i saw the thump tail I immediately tried it on my own. I somehow got it. However, the last part where you said you can write the answer a different way I don't get that any at all..
Hi - Thanks for the feedback, the last bit can be a little difficult to work through and it's not really the main point of the video. Glad to help though and all best S :-)
Thank you so much, struggles with Professional Level Accounting Course brought me here 😂
thanks so much, i finally get it now
Glad to help and all best S :-)
Does it matter what way you write it? For example if you put It as k-3 over 2-k instead of 2-k over k-3. Thanks!
Yes, it does matter as you are dividing by a number that is completely different.
Been stuck in a T5 (Foundation Tier) Class for the past year and Ive moved up to a T6 class(Higher). So now I'm having to learn a years worth of higher tier stuff in the space of about 6 7 weeks! Thanks for the brilliant tutorials!
Glad to help and all best with your studies! Congrats on moving up a level S :-)
i took this lesson over 4 times now cuz i keep forgetting
but now i remember, my sir made a bad job of teaching me this.
thanks sir
actually saved my life
Lol - glad to help :-)
thank you, this really helps
Really helped thanks
Thank youuuuu soooo muchhh
How do you do a simple one like a=x/b? Make X the subject
Hi - multiply by sides by b .... and you’ll get ab = x. If you prefer you can write as x = ab. Best S
@@3minutemaths Thanks
Thanks you suooooo muchhhh
This is a GCSE question? I have this in year 7
Abdullah Mohammed When you get to year 11, you would’ve forgotten it and come back here (:
@@Haroooon_some yr 7
I have it too but I’m in yr 9
@@broccolisalad9556 same I have a test and irdk what to do
A= mn
-----
10
How do I make n the subject of the formula?
Shannon Tyldesley 10a/m=n
10a-m=n
Could the answer possibly be written as 2-1/k-3 ?
Hi - it could be written as 2-k/ k-3 …. best S
thanks a lot ,i admire you
oh dear the third line nearly made me spill my drink
Thanks sir I now understand it
That's great and glad to help - all best S :-)
i like his pen :)
it's nice
Would 'k-2/-k+3 = n ' be correct or did I mess up?
Hi - you should get a +2 as part of the numerator, the full range of answers are at around 4.16. Great that you worked through it! :-)
Thanks, I managed to get it it right now
Thank You good sir.
This is almost too helpful I have understand far better than in class
Tysm my igcse external exam is tomorrow. Wish me luck
Best of luck!
Simon Deacon thanks!
Wow! i didnt know this was a GCSE question, im in year 5
I like it very much 😊😊😊
That’s great and glad the video helped - all best with your studies S :-)
Thank you so much
God bless you!
thx a lot, now I understand.
Glad to help and all best S :-)
Great help
Thanks
Hi sir tks for sharing
Pls if I start with 3n+2=k(n+1) I get ans as n=k-2/3-k why pls help
Hi - I’m really sorry, but I’d need to see your working. Here’s a video with worksheet and answers that will give some more practice: ruclips.net/video/nJ2DuFvCNpM/видео.html. All very best S :-)
K =3n+2/n+1
3n+2=k(n+1)
3n+2=kn+k
3n-kn=k-2
n(3-k)=k-2
n =k-2/3-k
However this ans is also correc also if you need to go back to your ans you mult this throughout by -1.
@@glasssmirror2314 Hi - yes, your answer is perfectly correct … and a little more elegant than mine :-) All very best S
@@3minutemaths
Tks sir
Thank u so much 🥺
Very welcome and glad to help - all best S :-)
thanks bro these things were rally messing me up
Very welcome and glad to help - all best S :-)
ily man
if similar problems has occurred, should I always do this method?
Haha I'm having this "change the subject" test tomorrow.. I have prepared well Alhumdulillah but some of the questions in my textbook are just too darn HARD!