How to factorise algebra formulas - higher GCSE cross method
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- Опубликовано: 6 сен 2024
- How to factorise algebra formulas - higher GCSE cross method. This is the third factorisation video in this series and is aimed at higher level GCSE students aiming for a grade A or B.
I hope it helps and please add any comments below.
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Simon thanks for the help because my teacher could not teach me in a way I could under stand factorising and now you have done this video I have got it. Thank you so much
I'm revising for my Technical trade test for the British army and you've been a huge help, thanks
thank you as my maths teacher didnt explain it as good as you!
Finally a person who can explain maths and sounds english!!
Glad to help Caitsma :-)
hi i am doing Calculus and i have a problem with factorizing but am so glad i watched this, i like this method, its working for me and it takes a lot less time to do, thank you very much.
Hi - that's great and thanks for the comment. All best S
Hi - that's great and glad it helped. Good luck with your exam!
Nice video, it helps me a lot, the speaker hit the nail on the head. Looking forward to see more good videos.
That's great and glad the video helped :-)
This is easier than I read my discovering mathematics 3A for year 9 textbook. This is so useful to me and I understand everything than my teacher teach me. Tq ^_^
That's great and glad to help :-)
Thanks for the video. Really helped me for my test. :)
Hi Rishi - yes, there are other ways. You could plot the graph, use the quadratic formula or the 'difference of 2 squares.' The style of question might help - perhaps if it says to 2 decimal places, it could be a quadratic formula.
With y = 2x-3.
- it's a straight line graph (not x squared)
- it crosses the y axis at -3 (when x = 0)
- it's a positive gradient (as +2x)
From here use a grid with different values of x (-4 to 4?) to work out y values.
Hope this helps and good luck ! S
Hi simon,
I was not able to solve or even to get the right answer to many factorization questions but fortunately I found your lesson on youtube and this amazing and creative method to help me solving all of these kinds of questions:)) i am really happy and thank you !!
Hi NASAR AL-MAHROUQI glad to help :-)
this method is brilliant, thank you so much you are a great teacher.
+Shaun Fraser - Glad to help and all best with your studies :-)
My teacher never told me this method! Thanks man.
+Howling Westy (Westy Gamer) - Glad to help and all best S :-)
Im actually 11 and im really clever so my maths teacher gave me a higher tier gcse paper and i needed help this really helped me with factorising thnx
The cross method what an eye opener. I will try it
That's great Ian Williams and glad the video helped :-)
I'm dyslexic and you're the only maths teacher I can actually understand and get things right. The only thing I'm confused with is when you said 2x had to go on the 1st section of the cross and then the other x went on the 3rd. Why didn't the x go on the 2nd section?? Thank you so so much by the way and please keep making videos! :)
Hi - the 2x (1st section) and x (3rd section) are both multiplied together to make 2xsquared. Hope that's OK and glad you like the videos :-)
Simon Deacon hi does cubic factorisation come up in maths higher gcse aqa
No prob and glad it helped - all best for your exam.
wow!! know i realised that factorisation is easy!
i wish i had a teacher like you~
Hi Fakrul Ashik Glad you found it easy! All best S :-)
Yeah, factorisation IS suppose to be easy. Easy to learn, hard to applicate
Have an exam tommorow, you may have just saved my ass. Thanks a lot !
Good luck with the exam! phil hague :-)
thanks so much, my gcse's tomorrow!
thank you very much, same situation, maths exam tomorrow and i don't have a clue how to do factorizing. biggest worry is my teacher and parents think i can easily get an A* in my gcse (i'm in yr 10) and i doubt it. anyway thanks for your help.
Interesting method.. just clicks for some people more than other, more traditional methods.. LIKE ME THANKYOU!
Thanks Charlie Morgan and all best with your studies :-)
fair play deaco! big help, much appreciated because my teacher said this was definately going to be on the junior cert higher level paper
Thanks, very well executed video helps me a hug amount :D
That's great JONO FLYFI and glad to help :-)
No prob and thanks for comment. Good luck with exam - all best S
+Simon Deacon you explained this video briefly now I know math more thanks man.
+Silent Killer - Glad to help and all best with your studies :-)
+Simon Deacon what about 18p square-8
+Chia Yi Heng - Hi - it would factorise as 2 (9psquared - 4) . Best S :-)
This is a amazing, thank you so much
Glad to help and all best S :-)
thank you so much man i know for a fact this is gonna come in my exam and this vid helped
This method is so awesome
That's great and good luck with your studies!
i have a question. when you did the method you wrote
2x
\ /
/ \
x
how do you know the 2x is 1st and that x is 3rd?? i mean surely it would be different if x was 1st. how do i know which one goes first? please help me
Nice and simple explanation.
Thanks Ambrose Ip - all best S :-)
Ur a god at math sir
how would i factorise 2x sqaured plus plus 3y sqaured q2 is 8x sqaured minus 2xy minus 3y sqaured
Thanks
That's great - glad it helped :-)
loved the video! very nice explanation.
Thanks and appreciate your comment ! All best S :-)
do you have a video on how to do longer ones such as "9a squared - 6ab + 12ac - 8bc" ?
it would help a lot, thank you
+Lisa Dunne - Hi - here's a video that might help - ruclips.net/video/aogHQZJQRY4/видео.html - All best S :-)
extremely helpful :) subscribed! thanks mate.
No prob Matty mac and glad to help :-)
I've heard that this method isnt allowed anymore due to a change in the marking sceme where we have to use the quadractic formula to solve this :/
+Caleb Khaw - Hi - all the methods are allowed and you can certainly use trial and error, cross method, quadratic formula or completing the square. The things to be careful of are:
- if the question says "significant figures" it'll definitely be quadratic formula
- completing the square usually says something like a + rootb
- try cross method or trial and error but, if you don't feel confident, go straight to quadratic - it'll be easier to do
All best with your studies S :-)
a bit tricky but very useful thank u so much :)
That's great and glad to help 😃
You're a life saver!
Thankyou so much , from Athena and esme !
hey simon I am currently starting my GCSE's and I was wondering what other ways are there to do the equation in the video above. the cross multiplication helped me get really high marks in a mock test and I am looking to get A*. also how can you plot lines on a graph with an equation like Y = 2x -3
My maths hwk features two factorising questions, one that this method helped me complete very easily, and one that has gotten me exceptionally confused.
It says x^2 - x - 56 = 0 , and is a solving question, but the text advises that i factorise first, please help.
Hi Fam Conroy you'll need to factorise first:
x^2 - x - 56 = 0
becomes
(x - 8)(x + 7) = 0
so x = 8 and -7
Hope this helps :-)
Very useful, thank you.
Thank you so much! This helps me alot with my Aviation Logistics course! :)
Your videos are very helpful but haven't you got any for statistical diagram and scatter graphs please
Hi chalie stone glad the video helped. I'll be posting some more soon and will let you know when statistics are available. All best S :-)
Ooh okay. thank you
Just found your channel, great stuff!
you are amazing this helped me a lot
+Iftxhar04 - Glad to help and all best with your studies :-)
hi. i was wondering why there is no letter or num outside the bracket
Hi S ALI .. it depends on the equation you're factorising . I'll add some more videos and let you know when posted. All best S :-)
Thanks so much this was so useful. Do you know what grade this would be in the new GCSE levels? I am in year 9 and we do this kind of equation now.
+TromboneManDan - Hi - I think this would be around level 6 as it doesn't require quadratic formula, completing the square etc. All best S :-)
Can't you factorize it as ( 2x^2 _ 6)(x_1) ???
Hi Ahmed... unfortunately this wouldn't work as when I multiply the first term 2xsquared by x I get 2xcubed. Then mutiplying 2xsquared by -1 and so on.
The end result would be 2xcubed - 2xsquared - 6x + 6
It's a great question though and thanks for thinking it through. All best S
Thanks was well explained.
Daniel Gresse Glad to help :-)
Very helpfull well explained
That's great and thanks for the comment :-)
is there any other method in order to work this out apart from this one?
Hi ABBAS FARRUKH .. you could also use the quadratic formula. It's usually for more difficult factorising but works well with all formulas. Here's a playlist ruclips.net/p/PLPglScc3TJ-O2zVEZXTVuP-o8WYm93xyd
All best
S :-)
Could you please help me, this question is going to come up in my test, I know the answer, but I don't know how to get to the answer. Even though my test is today, I don't really mind as I'm really confused.
Solve the equations:
x^2 + y^2 = 36
x = 2y + 6
its simultaneous equations
do you have a video with cubique polynome factorisation?
Hi - not at the moment but I'll let you know when done. Rgds S
Interesting method...
It’s an extremely interesting method indeed but it’s very simple and lets the younger s have a better understanding. Hope this helps and good luck with your exams
aww thank you so so much
Thanks sir your video helped me a lot and I subscribed also
Hey I'm so sorry but I need help what is,
Xsquared -3x-10
Xsquared-64
2xsquared+7x+3
Hi Molly Womersley
xsquared - 3x - 10 would be (x - 5)(x + 2)
xsquared - 64 would be (x + 8)(x - 8)
2xsquared + 7x + 3 would be (2x + 1)(x + 3)
Hope this helps and all best S :-)
Thanks
Sir can you help me on how to factorise this one 12a³bc²-8a²b
Bernice Herunga Hi - the highest common factor of 12 and 8 is 4, and the hcf of acubedbcsquared and asquaredb is asquaredb .
So, 4asquaredb(3acsquared - 2)
Sorry - I don’t know how to write a^3, with an index, like you did!
Best S
Does it matter which way you put the numbers in the cross (5:29)? The 3 and the 2?
Hi - yes, it's quite important to work through with all the numbers in the right place. Best S
@@3minutemaths so does the biggest number always go on the top and the smallest on the bottom
@@priya200328 Sorry - not always. I'm going to post some other videos with an alternative method that might help. I'll let you know as soon as done. Best S
@@3minutemaths ok thankyou
I am so grateful! Thank you so much! :DD
good videos
Thanks Phillip Phillips - glad to help :-)
Very helpful, thanks
Glad to help Adam G. :-)
Simon Deacon need help please answer me ASAP
same here mate!
HELP!!!what is the answer to this equation3xy2 - 6xy (the number 2 is a square )
+Keeleigh Gibson - Hi - look for the common number (3) and then the common letters (xy). You get:
3xy (y - 2)
Here's a video ruclips.net/video/aogHQZJQRY4/видео.html that might help and all best S
Thanks
Thank you!
Glad the video helped :-)
thankyou so much
really helped thx
thx so much Mr Simon... : D
Glad to help Sumner Bob :-)
tq...you help so much......
Hi baihaqi hakim glad to help :-)
and you get 2+2=4 and divide it by the 6 and get the 2 and 4 and done!
+Angel tonny - Hi, OK ... you need to be careful mixing addition with multiplication. Unfortunately there aren't any short cuts with this type of method. If you're not sure, try the quadratic formula. Here's a playlist that might be of help ruclips.net/p/PLPglScc3TJ-O2zVEZXTVuP-o8WYm93xyd
All best S :-)
+Simon Deacon Good combat
Thnxxxx im in yr 6
Its very helps !
Glad to help Ngah Arshad :-)
Sir what about 4x squared minus 9?
+Tomás Casimiro - Hi ... this is called the "difference of two squares." It just means that, as 4 and 9 are both "square" numbers you can factorise to:
4xsquared - 9
= (2x + 3)(2x - 3)
Same with:
25xsquared - 49
= (5x + 7)(5x - 7)
Hope this is OK
Best S :-)
Thank you very much Sir
Your Great
Thanks ASVBVV and glad to help :-)
how to factorize 3xsquare -16x+5
Hi - that should work out as (3x - 1)(x - 5) ... it's a little difficult to go through on comments but perhaps try working back with the cross method. Here's a playlist with some other examples: ruclips.net/p/PLPglScc3TJ-PgEVPNvC2blKA0zlg5hQVT. All best S :-)
Simon Deacon
i know how to do now, thanks for your video and comment as i will have a exam tmr. about maths.
That's great and all very best for your exam!
What about when you have four numbers
Hi - can you give an example?
Best S :-)
Damn thank you so much!
m8 Glad to help :-)
perfect explanation but why is it so easy?
I found it was really helpfull
Callum Roxton Glad to help and all best for your studies :-)
i need learn how rearange formulaes with factorising
I'll post a video and let know when done. All best S :-)
Simon Deacon
awesome
got any advice on 3d trigonmetry
stephen barker Hi Stephen - I'm posting 4 videos, in a playlist 'How to work with vectors.' This should go out tonight at around 7.00pm. Hope it helps :-)
Simon Deacon
awesome just finished factorising
PROPER BOSSMAN
You legend =D
Glad to help and all best S :-)
This should take 2 mins its taking you 9 omg
Nonsense
Hi - thanks for your comment - how would you explain this type of factorisation?
fancy making a 2 min video for me then?
Its very helps !
Glad to help Ngah Arshad :-)