I want to cry, ive been studying this for hours and just couldnt get it (have a math test tomorrow). This video made me understand it all THANK YOU SO FUCKING MUCH
@marcusmiguel1850
7 жыл бұрын
You're welcome.
@animationspace8550
3 жыл бұрын
Please don't swear in this minecraft christian server
@muh.7
8 ай бұрын
How are you now?
@AllThisPower
8 жыл бұрын
I'll be honest, I don't pay attention in class because I know I'll just come home and watch The Academy's video. The bonus factor is that I will understand in under 15 minutes what my teacher struggles to explain in 50 minutes.
@tadenhartley8626
8 жыл бұрын
So true
@melvinsansores1528
8 жыл бұрын
hahaha me 24/7
@entoxicated5785
8 жыл бұрын
mine is different i pay attention to class and dont understand shit then come here but still 50/50 im at grade 11 by the way
@vicvillardo3754
8 жыл бұрын
I'm at Grade9 and damn it's so hard.
@mjgonzales479
8 жыл бұрын
8th grader here. Can't understand a thing
@Xavier316025
8 жыл бұрын
This 12 minute video has me understanding this unit more than my teacher trying to teach me for 55 minutes...
@nikaash1
8 жыл бұрын
+Bobby V I know right. Me too.
@parsabahri
8 жыл бұрын
Yeah same with me too. Wish all our teachers we're like this video, short and simple
@samiahmad3355
6 жыл бұрын
Exactly
@alexw.4376
6 жыл бұрын
I dont comprehend well so i understand but my class period is 90 minutes so i would know you pain. Im not that good in Algebra 2
@ProgressiveDaily
7 жыл бұрын
Why is math so god damn difficult
@kaianielsen9310
5 жыл бұрын
retweet
@diegocordero676
5 жыл бұрын
Because you don't study?
@__________________________4073
5 жыл бұрын
It’s made to be confusing .....
@aiexzs
4 жыл бұрын
@@diegocordero676 its the skill, you're just being dry
@Zenoferrum
4 жыл бұрын
@@aiexzs simp
@fahauff
7 жыл бұрын
I get it on here but look at my homework and go what is this. My homework is out of the prentice hall algebra 2 book and you can learn one thing sitting in a class where the problems are simple but get the homework and it’s like I don’t understand it.
@Newstarburst
13 жыл бұрын
you dont understand how much i love you, my teacher is probably 100 and can barley explain to me anything. you made things so clear to me, thank you.
@ambermahone5930
8 жыл бұрын
I think people learn more from khan academy is because he doesn't use the core learning system
@ItsEpicXD
8 жыл бұрын
He teaches better then my teacher.
@zachweitz525
6 жыл бұрын
I learned more in this video than the entire unit my teacher taught on this for 3 weeks
@forks.8464
5 жыл бұрын
i literally love you thank you sm for teaching me this
@hasanaseel1803
2 жыл бұрын
nah dawg this is much easier that i thought after you explained
@TemmaCake4991
13 жыл бұрын
"Hopefully you found that slightly instructive"? more like incredible instructive!
@ancajaschristianlloyda.6388
9 жыл бұрын
Is the... method of transforming rational algebraic equatiion to quadratic equation present .?? Right Thanks .....a lot... i owe you ..my presentatio and assignment ia pres...
@nikaash1
8 жыл бұрын
+lloyd ancajas ???
@ancajaschristianlloyda.6388
8 жыл бұрын
Never mind ....important is i am happy with this video
@JIMFOX4499
5 жыл бұрын
at 4:25 I dont understand how you take x^2 + 2x -8 and factor it down to x+4 times x-2. I see were x+4 is because the power of two but i cant figure out how you get the x-2
@rank1herosaitama986
4 жыл бұрын
Lol, same dude. I was confused in that part. I thought it was just me... thanks for existing in the comment section!;)
@elizahalbrook7088
4 жыл бұрын
Here's the explanation even though it's super late hahaha He factored the denominator x^2+(2)x+[8] ____+____=(2) ____•____=[8] ^ ^ 4 -2 So the factored form of x^2+2x-8 is (x+4)(x-2)
@michaelflores2203
5 жыл бұрын
For the second problem how did you get x+4 and x-2 as your least common multiple?
@rank1herosaitama986
4 жыл бұрын
same dude
@ksagamer1401
6 жыл бұрын
Thanks for the explanation
@mohamedibrahim9964
5 жыл бұрын
The best 13 min ever
@authorpaulepetty
4 жыл бұрын
4:31 Where did the 4 come from? Sure, it’s on the left side but how did you just pull it out of the right side?
@janiquad18
8 жыл бұрын
under x^2+2x-8 how did you quickly get (x+4)(x-2) ..I just checked to see if it breaks down into that, but it was no hesitation for you.
@Cgarcialeyva
6 жыл бұрын
I love you omg helped me so much 😭
@pey5571
7 жыл бұрын
bless khan academy
@big4headedGangster
3 жыл бұрын
I don’t understand. This feels exactly like my teachers explanation.
@fredpatrickgaines4138
6 жыл бұрын
we are still here with you
@crisjerichomabutas139
6 жыл бұрын
why use negative 5 to cancel
@henryboldi
11 жыл бұрын
Just quadratic formula
@markcollins8971
4 жыл бұрын
Now I'm in 7th grade and this is so confusing to me
@jmiril6793
7 жыл бұрын
Why did he add the 11 ? Shouldn’t it be 11 - 10.63 ?
@nikaash1
8 жыл бұрын
Lol listen to this at half speed.
@dylanwhitney3233
11 ай бұрын
does anyone what he wrote? im lost because all the numbers
@dasten123
13 жыл бұрын
@zacrichards1 maybe this is photoshop (using a graphic tablet)
@jamesorario2538
2 жыл бұрын
san nang galing yung 5x tol?
@anavillalonga3839
4 жыл бұрын
Lost me at the end
@photoburstchan9581
8 жыл бұрын
why is 3(13-4) =35, I am getting 27. Anyone else?
@photoburstchan9581
8 жыл бұрын
Don't we do what is in parentheses first?
@eleniabebe251
8 жыл бұрын
No we would do something called the distributive property where multiply everything in the parenthesis by the outside number(in this case 3)
@julieballs3994
2 жыл бұрын
my teacher isn’t good…i literally spend hours teaching myself
@Dusta_Rhymes
6 жыл бұрын
All this work would make you think you solve something super complex. Nope. Just a line on a graph. I hate my life.
@wyatt8062
6 жыл бұрын
I wish they'd go through equations that didn't work so well. ike equations where you have to do a little more and it doesn't all just seamlessly fit together
@pixelfox9235
2 жыл бұрын
Exactly
@addieseidel4271
6 жыл бұрын
Math is the devil's language.
@el290
4 жыл бұрын
Addie Seidel Don’t put that evil on him. 😂, he’s about having fun.
@couchpotatoxxmusic184
4 жыл бұрын
@@el290 😂 have you seen the tv show Lucifer yet?
@SoulSearch11110
11 ай бұрын
Faaaaaaacts!
@MasterofrandomAlex
5 жыл бұрын
Remember when a math problem could be written in 5 seconds not 12 minutes??
@leno1900
6 жыл бұрын
Sometimes I wish that I have the same mind as the one speaking in terms of mathematics.
@crossfadez5521
5 жыл бұрын
Sal, first of his name.
@MmjCY
3 жыл бұрын
Love your headshot
@pattc_playz5125
2 жыл бұрын
Same.
@haleypattinson4164
12 жыл бұрын
i love how he types everything out even, "let me scootch it over a little bit...."
@brianhunteroehme8512
10 жыл бұрын
I learn more from watching khan academy then I do sitting through a 55 minute class
@theatagamer90
9 жыл бұрын
To true and my classes are 1hr and 30min... tells you that he should build education systems shouldnt he...
@nikaash1
8 жыл бұрын
+Brian Hunter Oehme Me too. But I don't have a good Algebra 1 teacher.
@remifan6891
6 жыл бұрын
Khan plz never stop these videos, bc my teachers r terrible and I understand bc of u!!!
@dragonjade8853
6 жыл бұрын
Pretty good except ya kinda lost me when the whole quadratic equation stuff... The worst part is that we went over this stuff in math class
@popstarpigs6677
Жыл бұрын
Bro just saved my life bc I have a final today and couldn't remember how to do this
@nikomar110
9 жыл бұрын
I lost you at 8:00
@EXOglobe
8 жыл бұрын
+Anonymous User Using the "quadratic formula" you can determin what X is equal to. So if you get a complicated question where your final quadratic cannot be used by factoring, you use the quadratic formula.
@pockydust3404
7 жыл бұрын
Its the quadratic formula, he just plugged in the a, b and c terms into the quadratic equation. x=-b+-sqrt(b^2-4ac)/2a
@sydneykane2033
8 жыл бұрын
7:40 ya lost me here
@pockydust3404
7 жыл бұрын
Quadratic formula, its when you want to find the zeros or roots of the equation. Its really easy once you get the hang of it
@donovan12340
6 жыл бұрын
You failed
@corey5454
9 жыл бұрын
Thank you sooooo much, I'm taking the Precalc CLEP exam and this is soooo much help.
@theforkster1
10 жыл бұрын
ETIFETIS: Each Term In the First Times Each Term in the Second. So much better than the old school FOIL, because it doesn't work on trinomials.
@untitled2006
5 жыл бұрын
**initiate confused screaming**
@rank1herosaitama986
4 жыл бұрын
4:02, it supposed to be x to the power of two +2x+2! Not x to the power of two +2x-8! -2+4 is equals to positive 2!
@radlad3966
4 жыл бұрын
4:41 Isnt x times -2 equal to -2x and not +2x?
@vampirekairi3
10 жыл бұрын
I learned that shit already in advance math but we never simplfied the square root... We left it as it was bc we werent allowed to use decimals unless it was a perfect square and 113 isnt a perfect square...
@pockydust3404
7 жыл бұрын
You could simplify the sqrt of 113 though
@shizuchuan
7 жыл бұрын
Hey why on the first example you add 8?
@shizuchuan
7 жыл бұрын
BTW We're probihited to use Calculator T-T
@pockydust3404
7 жыл бұрын
Well when you want to remove the -8 from one side, you have to add 8. That makes it zero, and one thing you do on one side you do on the other.
@bens.5270
7 жыл бұрын
You have to add 8 to both sides so they cancel out
@leehailey3479
6 жыл бұрын
Hi, I have a question I'm struggle with for hours now. Why do we not multiply the denominator by the Least Common Factor too if we're solving the equation? But if we're simplifying an expression, dont we have to multiply both nominator and denominator by the LCF too?
@chrishensel9198
4 жыл бұрын
God bless this atrocity that is math
@hanslouisolinger9244
9 жыл бұрын
Thanks, this video was very helpful for me. Tomorrow I'll be taking my math exams and rational equations were one of them.. Thanks a lot Khan Academy!!!
@michaeltravers9228
11 жыл бұрын
what the frack, where did the square root come from?
@zango3134
4 жыл бұрын
Haha he turned the equation into a quadratic formula. It’s how you can solve quadratics and you can do it when you have an equation where the first term has an x and is squared, and second term with an x (not squared) and a regular number. When there are usually three terms like that, you can plug in the values (not including the x’s) into the quadratic formula to solve the quadratic.
@Schnort
3 жыл бұрын
@@zango3134 I love that you replied to a 7 year old comment. What a legend, thank.
@thestars1534
2 жыл бұрын
im a trying to learn grade 9 maths as a grade 7 for a entrance exma for my ney school on the equation at 2:53 why did he add the -5x
@ilinaeternity
11 жыл бұрын
He just simplified both sides of the equation. He had: 5/35 = 2/14. 5 divided by 35 = 1/7. 2 divided by 14 = 1/7. Since 1/7=1/7, that means that the value of "x" which he put in is the correct one and is a solution.
@TheOneTruePesky
8 жыл бұрын
My teacher does a horrible job explaining things, plus the fact that she just shows us what to do instead of how and why you do it, and on top of THAT it's hard for me to understand math quickly. This really helped. A 42 minute ill explained lesson compressed into a 13 minute well explained lesson
@vincentbissacco9807
6 ай бұрын
3:06 does anyone know what to do if you have something like negative X on one side but nothing on the other
@raziahmed206
7 жыл бұрын
Fucking son of a bitch made a big ass problem solving this problem
@DKAQI
5 жыл бұрын
I didn't understand what did you do at 2:27
@rank1herosaitama986
4 жыл бұрын
same!
@iH4T3BR3Di
12 жыл бұрын
you're awesome man, i love how you teach. thanks!
@shaunavanderhorst
5 жыл бұрын
I'm confused as to how you were able to rewrite x^2+2x-8 into x+4*x-2. I know it is possible, but I don't know how you did it. If someone could explain this, that would be great (: @4:26
@jah-4
2 жыл бұрын
Hey, I know am 3 years late but there may be others with the same question as you so here I'll simplify it step by step. Step 1: AC Method The quadratic x^2+2x-8 is in the form ax^2+bx+c. This will work for any trinomial. It's called the AC Method because we multiply A and C, which in this case is 1 (because the coefficient of x^2 is 1) and -8 and we get -8. Step 2: Factoring Now that we have the number -8, we have to find a pair of numbers that when multiplied will equal C (-8) and when added will equal B (2). You can go ahead and list the factors, like 1 and -8 is a pair, or -4 and 2. Once you get the hang of it, you can quickly factor in your head. He saw that 4 and -2 multiply to get -8 and add to get 2, which is why he ended up with turning that into (x+4)(x-2). Hope this helps :)
@shaunavanderhorst
2 жыл бұрын
@@jah-4 Haha, well thanks anyways! I'm sure it helped others. 3 years later, I can look at the equation and figure it out now, so I guess I am testament to the success of the schooling system.
@RAYHARRIS1970
10 жыл бұрын
it would help if you explain every step in more detail when you get to end .
@pockydust3404
7 жыл бұрын
But he's not explaining the quadratic formula in this video, therefore, he would just get through it fast. The explanation for solving rational equation was pretty detailed though.
@halofire4725
8 жыл бұрын
What do we do if we are not allowed to use calculator
@justinmarcus259
7 жыл бұрын
you lose
@pockydust3404
7 жыл бұрын
You can solve it in your head, but if you don't have a calculator you can leave the square root without solving it. You could also simplify the radical expression, unless its a perfect square root. Its weird that you're not allowed to use a calculator though
@skiingrulz101
11 жыл бұрын
you sir are a god
@big4headedGangster
3 жыл бұрын
Thanks, now i understood when you had to use a calculator.
@dylanwhitney3233
11 ай бұрын
Please help bro? this just blows my mind
@jerichocopeny5552
6 жыл бұрын
Teaches me more in the first 5 minutes than 90 minutes of teacher time. Amazing.
@columbo6292
4 жыл бұрын
I know this comment will go unseen here, but I'd feel guilty if I didn't thank Khan Academy for the full lesson they just taught me in less than a quarter of what my teacher would spend on the same topic. Thank you!
@dalerush1082
5 жыл бұрын
I don't know how fast you could respond to this question but in my college algebra 1 class I'm struggling to understand this equation with rational equations. It's x^2 - 10x + 25/ 3x-5
@erlajade7696
6 жыл бұрын
thank you so much for helping the students like me
@siredready6140
6 жыл бұрын
i dont underStand your second problem
@jamesmccloud7535
4 жыл бұрын
I've been struggling with this for so many hours, I have a quiz I need to asnwer due today and the way our teacher taught us in our online class, I didn't really understand. Thanks for the vid!!!
@djsizzl3
12 жыл бұрын
you were doing swell until you got to the square root parts.....That is so Confusing!!!!!!!!!
@yxzyzzyx434
5 жыл бұрын
that's just the quadratic formula. very easy problem comparing to what's on my upcoming 7th grade algebra honors test tomorrow.
@sevenblade6370
4 жыл бұрын
Let's face it were only here because of class
@kennethgoldberg83
2 жыл бұрын
I always beg my students to determine the domain of rational functions first and without exception.
@ZombineMan64
14 жыл бұрын
I love being the first to watch a video :P Thank you fo rall the help and I love your videos!
@kenjimorales9436
6 жыл бұрын
How you doing mate hahaha
@stephenfisher5893
6 жыл бұрын
same lol cant belive i scroled all the way to the bottoms
@zipzapkpop
10 жыл бұрын
For the future people cramming their Algebra test (like me hehe) and scrolled down the comments section to ask where the hell the square root came from, it's because he used the quadratic formula to factor the equation. And you SHOULD know what the quadratic formula is, since you should've learned that from solving quadratic equations.
@blone7353
10 жыл бұрын
Lol same here
@anoverusedgenericmodelfrom687
6 жыл бұрын
I know the answer to (1/x) + 1/(x +1) = 2 It's x = 1/sqrt(2), -1/sqrt(2)
@paolaelizabeth2755
7 жыл бұрын
i have a test tomorrow and i’ve been pulling an all nighter just to get one question right. came to this and got it in less than 10 minutes
@pastariiqwq4300
4 жыл бұрын
why dont you make questions in the description to ask students, and then in the next video put the answers
@seadawn8559
4 жыл бұрын
you do realize this video was made in 2010, right?
@pastariiqwq4300
4 жыл бұрын
@@seadawn8559 nope
@Dom-sy3me
6 жыл бұрын
i have to say if math was not hard it would be soo broing
@KAYDENSAINTS
7 жыл бұрын
what is x minous y, over 4, plus x plus y, over 3 = 1 ,if you have to resolve for y
@jerfersonmatos28
6 жыл бұрын
In wich video does he teach about adding numbers to both sides?
@xxxYouTunesxxx
7 жыл бұрын
Learn this stuff early on kids, because learning it at 37 is a fucking pain in the ass
@garrettbreedon9691
5 жыл бұрын
This was more less of a video explaining the quadratic formula.
@ThatGuy-ig5tx
7 жыл бұрын
this video didn't help me i learned more in the 5 minutes i stayed awake in class today than in this entire video
@TheTeacH3RChannel
9 жыл бұрын
Thanks sir
@joshuakim3382
5 жыл бұрын
Thank you.........
@exclusivekairee
4 жыл бұрын
I'm so dumb 😧
@Leo-ef2tc
4 жыл бұрын
im confusion
@blone7353
10 жыл бұрын
Omg thank you so much i understand it better thx!!!
@prathumarikeri3397
5 жыл бұрын
Why can't you just cross multiply?
@MostElectronics
12 жыл бұрын
@cyclone2876 wtf no its not. he uses a usb drawing pad
@123taneh
13 жыл бұрын
WAIT! pleassee! How did it became minus 5x (-5) for both sides? at 2:53 ??
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