How to rearrange a formula with factorising
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- Опубликовано: 13 фев 2013
- How to rearrange a formula to change the subject. This video is around level A GCSE and deals with using algebra to change letters on both sides of the equation.
I hope it helps and please add a comment below!
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Basically a nice guy who dedicates his time helping people. Thanks for this.
Lol Michael Milne that's exactly what my mum says :-)
Bloody legend mate❤️
Thanks sir, this was more helpful than my weeks of being taught rearranging formula with my maths teacher.
Thanks, doing a finance class for college, but been forever since Algebra. Great update of some tactics I need for reformatting equations for Stock Valuation.
Omg I have been looking everywhere for a clear cut tutorial like this thank you so much it really helped :)
Hi, thank you very much for the help. I watch many of your videos to help me with GCSE maths and they are always very clear and concise.
Glad to help and all best S :-)
you make maths so easy.
Great video, this really helped me out (especially as I find this really tricky). I'll admit I had to re-watch the video a couple of times mainly because I didn't quite get it! Again great great video +1
Thanks very much, you cleared a lot up for me that my physics teacher couldn't cover because we move so fast through the course!
OMG thank you so much i literally found this a night before my exam on rearranging formulae!! Youve earned another sub!
Wish you were my math teacher haha. You make everything so clear. Thanks
+Alexander Manz - Glad to help :-)
Great Video! Despite being in top set maths, this has always been a topic that i have found difficult, your video helped clear up the points for me, although i think it is a little harder when the value on the top is not alone, e.g in your example it would be something like 8Q-3..
Hi RedfernModelRailway thanks for this and glad the video helped. I'm going to post some more videos on factorising with fractions and will let you know when done. All the best with your studies S :-)
Why can't people like you teach at my school...
Lol, made my day :-)
Why cant you teach maths at my school. You're the best at algebra which I dont have a clue how to do
I am so happy that i found your channel thank you so much for those amazing videos♥♥
Once again great vid, thanks for the help!!!
Thanks so much i did not get it at all until your tutorial
Glad to help Daniel Follant :-)
Very nice ji
hi can you do a vid on binomial expansions as struggling with them
If I get -100p/1-p, is it right. if right, how?
Zafar Badami Hi - yes, this is correct and you can prove by using a number in place of p:
p = 2 so, with your answer:
- 100 (2) / 1- (2)
-200 / -1
= 200
With my answer
100(2) / (2) - 1
200 / 1
= 200
Hope this helps and all best S :-)
I worked out this formula and put q as the subject but i got q equals 100p over 1-P, is this correct
Someone give this guy a medal
Thanks mate, taught it better than my lecturer :-)
Glad to help freaker77 . All best S
This video really helped me and I am struggling in Maths a bit. So thanks a lot
muhammad ali Glad to help and all best for your studies :-)
thank you
i also have a test on maths so I have been watching a lot of your videos. It is really helpful
muhammad ali Hope the test goes well :-)
thank you for your help, you gained me an extra 9% in my exam
I got 92%
Thanks Simon. Studying Astronomy with no Maths background has been really tough. Have to do a lot of these. Would love to give you some even more complicated equations to see you work those out ;-)
Sounds like a challenge mrjaffa1013 ! Glad to help and all best with your studies :-)
Great video! very useful! Thank you :)
That's great Marisol Buitrago and glad the video helped :-)
Sir, the videos are great and I'm really understanding from them but could you please improve the sound quality because at times I find it hard to hear what you are saying. Thanks
+Ali Attia - Glad to help - the newer videos are a lot better :-)
Hi Simon, can you help out with what form to give your answer in...or moreso....what the examiners consider a correct answer. So is K= (J+6)/2 just as acceptable as J/2 + 3 or (J+6)over 2 vs J over 2 plus 3. Similarly is 2(y+3)=X alright not to expand into 2y+6=X (the AQA answer sheet we have has it bracketised).
Hi - thanks for the comment. You need to be a little careful with the way you write the answers although there's no harm in writing them as simply as possible. Most examiners would be happy with (J+6)/2 and you don't usually need to go any further.
Similarly you wouldn't need to expand the brackets 2(y+3).
Hope this helps and all best S
Thanks Simon. Great stuff. Channels like yours are invaluable for us Home Edders....to be honest...I've enjoyed gettimg the old grey matter working again with the right attitude as an adult rather than my naughtu schoolboy self lol.
when factorising is there a trick to knowing if its minus plus and they go
This is all I needed to score 100% in my exam.
Hi sir,
what if you has something like n squared + a / n+a
would you have to find the square root of n?
+Charlie Stone - Hi - possibly ... it really depends upon the question. You need to have nsquared + a / n + a equal to something. Do you have a particular question in mind?
+Simon Deacon yh the question is :
p = n squared + a / n+a
and a has to be the subject
When at the stage where you have PQ=Q+100P, my next steps were: (-Q) PQ-Q=100P then (/P) PQ-Q/P=100. Is this still correct?
Hi gibbo1112 you're trying to get Q as the 'subject' so PQ-Q = 100P is fine.
Then factorise so Q(P - 1) = 100P
Then divide by (P-1) so:
Q = 100P / P - 1.
I'll post some more videos on this subject and let you know when done.
All best and good luck with your studies
S :-)
Your a goat , much better than my maths teacher
What about p = 2a + 2b and get b the subject I just don't get it D::::??
Can you help with my equation?
r+s/8s =r-s/8n. Rearrange to make r the subject.
x 8n both sides, then x 8s both sides
8n (r+s) = 8s (r-s)
divide by 8 to leave me with n (r+s) = s (r-s)
Don't know where to go from there. Help!
Hi - it's a little tricky but:
multiply out so you get nr + ns = sr - ssquared
Then you need to get the r terms on one side - suggest the rh as you have a -ssquared ...
ns + ssquared = sr - nr
factorise for r
ns + ssquared = r (s - n)
divide through by s - n:
(ns + ssquared) / s - n = r
Hope that helps and all best S
Thank you it really helped
thanks it helped a lot
How to rearrange L = S + ((8*d^2)/(3*S)) with d as subject?
Thankyou :) You're a life saver :)
Glad to help Orient Express :-)
This a blessing
really helped me. thanks
Amdeegamerz Glad to help :-)
great video! how'd you work out something like: y=1⁄2x+1
Hi - glad to help. To make x the subject subtract 1 from both sides:
y - 1 = 1/2x
Then multiply by 2 to get:
2 (y - 1) = x
All best S
Um how do you get the "minus 1" from ? I mean the one in q( p - 1)
Hi TheOrangedestruction thanks for the question. The -1 is there because I've taken out the Q from the original QP - Q equation. I need to have a -1 to replace the -Q.
I hope this helps. Here's a playlist on solving linear equations. The second video might be useful ruclips.net/p/PLPglScc3TJ-Mvi9Gk651-7y-bUJKC2y4H.
All best
S :-)
thx a lot
If it was something like 5a would they be separate or joined?
Hi 5a means 5 multiplied by a. Best S
@@3minutemaths So they are not joined and you can divide by 5 if you want to move it to the other side?
Thx very much
Thanks, this really helped :)
Glad to help Epicnerd73 :-)
Simon Deacon Helped with that question I posted but still got the wrong answer :\ It's very complicated, lol
How do you know when exactly to factorise?
EpicNightBlade Hi - there's no easy answer to that - you might need to factorise to rearrange an equation, like this video. Or the question might ask you to solve a quadratic equation, in which case factorising might be useful. Here's a playlist with a couple of different examples: ruclips.net/p/PLPglScc3TJ-PgEVPNvC2blKA0zlg5hQVT
I hope it helps and all best S :-)
same ,wish u were my math teacher
Let's hope this is in my exam tomorrow then!!
Alex Woodward All best for your test! :-)
hi is there anyway of knowing what A level rearanging if its harder than gcse
Thank you
Brilliant!!!!
Glad to help and all best S :-)
Wish I had found your videos months ago.... my exam is Monday.... eeek.. (and the last time I studied maths was 1987.....god help me!!)
Hi Wendy Mae good luck with the exam !
Thank you so much!
+Tom Adams - Welcome and glad to help :-)
Thank you so much sir
+kosar mustafa - Glad to help and all best with your studies :-)
how would you answer a question like t = k over K-2
Hi - to make k the subject:
t = (k)/k - 2
Multiply through by k - 2
t (k-2) = k
Multiply out
tk - 2t = k
Then you need to get the k terms together, and everything else on the other side
tk = k +2t
tk - k = 2t
Factorise for k
k (t - 1) = 2t
Divide through by t - 1
k = (2t) / t - 1
Hope this helps and all best S :-)
thankyou very much
thank U very much
Glad to help and all best S :-)
Probably one of your less bright viewers, but how would you rearrange this formula to make d (or b) the subject. { a/b = c/d }
I think it is d= a/bc or (b = c/ad)
Hi - (no such thing, it's all about the journey :-) )
a/b = c/d
you can 'cross multiply' so that ad = bc
To make d the subject, divide through by a:
d = bc / a
To make b the subject, divide through by c:
ad / c = b
Hope that's OK and all best S
clearest example
Glad to help and all best S :-)
How would I do
3x + 5
Y= ------------------
X
X = 5/y-3
so helpful
Glad to help and all best S :-)
Thanks, sir!
Glad to help and all best S :-)
:-)! Also, brilliant coat!
Lol :-)
thanks sir
Glad to help Kirt Crke :-)
It is a grade c question now
Shahzeb Khan IK!
wait hang on, don't the Ps at the end cancel out?
+Mahfuz Ahmed - Hi - great question - unfortunately they won't cancel as you've got xP at the top and +P at the bottom. All best S :-)
oh, ok thanks
everybody put the CAPTION english substitles LOOK WTF says really guys look!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
my brother calls you Jackie chans brother
Lol :-)
Thank you
+SJ Gaming - Glad to help :-)