Level 3 exponents

[CaptianKalo]

Starting college this week after 8 years of not being in school, this is helping me a lot as far as remembering things I forgot over the years, or learning new things I never learned (or instantly forgot)

[jransom0]

I think it would help allot morelocating videos was easier for s who want help with the courses their taking. Youtube has tags... usem with keywords your trying to explain from the videos dude

[elidontlie]

this should be on tv 

[Ben10cool932]

thanks i learned a lot. can u pl try to rite neater

[elidontlie]

@Ben10cool932 your a douche

[1989Firecracker]

Niggers can't do algebra.

[bryfryable]

for the problem -8 to the -1/3: the answer can be 2 as well since there is negetive 2 in the denominator. right?

[bryfryable]

for the (8/27) to the neg. 1/3 problem: would 1 over 2/3 be correct also?

[orangeboy97]

I'm 14 and he makes the problems very easy for me :)

[mony936]

this is helpin me get A's and Gals

[pooran411]

Now i say how easy is the exponent.

[eosvoboda]

"I used terminology without explaining it which is very bad" LOL

This is why Salman (Sal) Khan should win the Teacher of the Year Award and the Nobel Peace prize!

thumbs up if you agree

[Naatashax3]

Thanks I understand my math homework because of you !

[c2442l]

Thank you! I have forgotten all this stuff from school, but now my kids are doing Algebra and Trigonometry, so I am trying to understand their homework so that maybe I can help them. I've also got my kids doing Khan Academy. It's fantastic.

[Dilatory1]

i hate when u need to know these exponents rule

[Dilatory1]

i hate when u need to know these exponents rule

[realtorshannon]

41 going through it trying to understand my college algebra instructor. I decided to study alone. I find it hard to be instructed by others and this helps me pace myself on my own time. He is very clear and understandale!!!

[Blackseed1978]

i'm 33 and this is some difficult for me but this guy is pretty good with explaining he is so much help.

[tinashi4ever]

I couldn't understand until I watched your video thankzzzzzzz!

[Lacusness]

Can anyone explain this to me? The answer is 4/3 but I don't understand how that actually happen. 128^(1/2)/(8^(1/2) times 9^(1/2))

[Poseidon3987]

This is the BEST explanation on the whole PLANET!!!!!

[prisat32]

why did the negative go to the bottom of the fraction from the top at 7:14 ?

[PurdueRules15]

@prisat32 you cannot have a negative exponent, so you must bring it to the top or the bottom depending on the initial location if it is negative.

[GalladeTheWarrior]

FUCK i hate math. :\

[TheGoatSLAUGHTER]

Fuck Math its all about history :p

[TheMOMOmatt]

i got here from a snoop dog video

[KARISMAI1HQI]

500^400 reduce is it 62.5

[LadyClaudja]

Heaven sent me an Angel!!!! Thank you soooooo much!

[prence1725]

I find this one hard, but i wont give up. I i will just play the video over and over till i get it.

[iSmiffy95]

At about 7:40 he says that -2x-2x-2 = -8 can someone help me i got kinda confused because i thought that if you multiplied a negative by a negative then yopu get a positive? I would be greatful for some help/

[mentallymetallica]

@iSmiffy95 There are three negative numbers being multiplied there. If u multiply a negative by a negative it gives you a positive but since there are three numbers there's another negative number left. so the sum of a negative into a negative is positive so a positive multiplied by another negative is negative. :) Hope this doesnt confuse you even more. :)

[mylostmother]

damn thx bro mks sense know

[foosballbeast]

you make me feel smart =)

[babarfirasat]

what is the technique for doing a sum like 8 1/3 ?

what if i get a question such as 135 1/8, how will i be able to do that?

[TTRIPLEH]

@babarfirasat if you got 135 1/8, then you do 8√135. (8 is the index). then you just work it out and you get 3 8√5. (again, 8 is the index)

[vampireanimerocks]

my math teacher ALWAYS thought i was to stupid to get an A so i decided to actually study for my next test and at the time i was never paying attention in class i never understood what we were doing in class so i asked my friends to teach me wat they learned and i thought they sucked at teaching... so i found this and BAM!!!!! i actually got a B+ on my test usually i got Ds and Fs. u shoulda seen that look on her face!! but at first she thought i cheated >:(

[spirituelconnexion]

thank you :) !



[Electricutie2]

This is great! I usually ace my math tests, but if I don't understand something... I REALLY don't understand it. I used to freak out- but once I discovered this guy.... well I don't stress about math anymore!

[dlhilton1]

Yea I understood all the other videos till this one. and you keep your fractions top heavy aren't you supposed to spin them down?

[dlhilton1]

Yea I understood all the other videos till this one. and you keep your fractions top heavy aren't you supposed to spin them down?

[chris082681]

This is all fine and good... but stop using perfect squares for a base.. this doesn't help me at all!!!!

[raykasprowicz]

Thank yoy for another great tutorial on exponents.

[lexinaut]

(Like)(Like)(Like) = like to the third power. You get to the ROOT of many of the problems people have with FRACTIONAL and NEGATIVE exponents. Therefore I give this video a very POSITIVE rating!

[fungsit]

He explains exponent rules so clearly !! thanks God i saw this video!

[PtotheMtotheJ]

Thank you so much.

[01JH]

This is great but I think showing that you're taking the square root of a number is how you're getting to your answer would help. Also, a quick review of how to take the square root of a number would probably help some people. I really liked the variety of problems you showed. Thank you.

[Bebevv]

I <3 u :D

[EpicXI]

16 written out as a fraction, but un-flipped would have the 16 set as the numerator or denominator?

[ihopethisisavailable]

@EpicXI 16 by itself is the same as 16 over 1, so 16 is the numerator, with 1 being the denominator. Hope that helped!

[kaeli87]

soooo much easier your way than the way my stupid book explains it. i love you!

[Thevideoclown]

this is getting hard now

[esiosan]

Keep watching khan's videos until you learn it.

[ramblinevilmushroom]

i guess i understand the rules of it all but the 'why' isnt there :/

[MrRasgabriel]

You just Blew my mind...

[Seattle206723]

@MrRasgabriel LMAO.... Join the Club.. Let me guess you came from level 2 to this also? Then you were suddenly thrust through the atmosphere. Mind still fried from level 2. You heard what I heard, "Space the Final Frontier" in a booming voice. Then accelerated through space at warp speed. I know the feeling, luckily I took Astrology 100 this quarter. I can explain to everyone also aboard what a binary system looks like. lmao

[lemondropz07]

Thank you for posting all these videos. I'm reviewing math for an ACT test and I am finding them very helpful. Much appreciated! :D

[rebes91]

this guy is so good! I've struggled with, and hated math all my life! it's never made sense to me and now i'm actually kind of enjoying it! thank you so much! this helped a lot!

[dandiacalbody]

you are the fucking man, thank you soooo much

[MrBlamemeforit]

Love how he always take for granted that we are confused :D Keep it up Khan!

[rancid11999988]

KHAN U DA MHAN!

[bomberfun1]

how about to the power of 2/3 ?

[Khorne676]

thanks for uploading this - i have night school and our teacher has a heavy indian accent, makes it harder to understand lmao

[gur0004]

u are a perfect Teacher. U know how to explain things coz I believe u think on students' perspective and that's the key. Keep it up.

[JAnumber1shotta]

DarkHellBoy22 you are so sweet!

And that's coming from a man

[cheliel1969]

thanx

[mrbenn64]

hi there where can i find the practice problems that are mentioned at the end of the videos?

[troymitchum777]

thank you so much for the khan academy. such a great help.

[marcuelcajon]

Totally lost me!

[DarkHellBoy22]

i'm 57 and find myself having to learn it, to help my kids get a better ACT score for college..

[KelferMookie]

@DarkHellBoy22 You need to learn how to write sentences also.

[mysonchanz]

@KelferMookie lmao

[IMBLUESTREAK23]

I get it, great work.

[tubolclorosis21]

i cant get it 2 =T_T= pls help

[HowAboutSomeTruth1]

Ok so how do I work out harder exponent numbers like 60^1/2... what times itself 2 times equals 60?

[hammurambi]

finding the square root of 60 is not easy in your head, you can find it by guessing and multiplying but it's easyer to use a calculator to save time

[AquaCatClaws]

sure got that right

[yasuodances]

Yeah deff melted my brain with this one lol, but it was great to learn. Thanks.

[gots900]

damn this is boring but anyways i dont get it help me

[musiklover2]

@gots900

Check out youtuber: yaymath

he entitled it, solving radical equations.

he explains it differently which I think is simpler.

[musiklover2]

@gots900.

try the one that yaymath has entitled "radical exponents" that one is more similar to the one that khanacademy is showing us here.

[TruePlayed]

i don't get it, help me pls

[sk8tterpriincessss]

i dont get it!? helpp!?

[AquaCatClaws]

my brain IS meltingggggggg....

but at least its melting AFTER it got the problem.....

maybe i should write this down ?

this isnt in my math book.....

[aero1927]

i understand this ok but when will we ever need to know 8 to the 1/2 power.........like seriously????

[AquaCatClaws]

ikr ?!?!  who in the right mind invented math ? i'll go as far away from it as possible man !!

[AtheistThatsATheist]

Where would a handsome chap like myself get these level 3 practice problems? Ive had a look on the Khan website but cant see them :S

[TeamFortressKilla]

its under the self-adaptive math program, which is at the top of the page. You have to work up to them from basic addition. The programs a little flawed and limited at the moment but hes working on it..

[sov19871987]

hahahah, thank you, eazzzzyyyyyyy

[crumcon]

Could anyone solve : -8^-3 ?

Khan brushed it off.

[kozes]

so if you have a negative exponent. you flip it?

-1 over 8 to the power of 3

= -1/8 · -1/8 · -1/8 = -1/512

negative 1 over 512

its negative because a negative times a negative times a negative is a positive

[fg1i]

n^-k = 1/n^k, then,

= -8^-3

= -1/8^3

= - 1/512

[Bullwiggit]

Yeah dude, I got that -8^-3 is the same as (-1/8)^3 which works out to  -1/512

[ramblinevilmushroom]

i was very confused before the end D:

[stefinjapan]

I'm so grateful that this person exists and helps us mere mortals. I've been out of high school for 15+ yrs and college 10+ yrs. Needless to say I've forgot the basics. This has been so helpful for me to study for the GMAT. I feel alot more confident now about taking the exam.

[prence1725]

@stefinjapan what is gmat? is it high school or college maths?

[done871]

those number mean nothing

[sparky0o]

make your own video then.

[turdcoat]

Epic videos

[quaziashfaq]

Hi,

Your math presentations are very good. They will help the students, who are afraid of raise questions in class, consult them and learn by him/herself.

At the beginning of this presentation, if you say that "4 to the power 1 = (4 to the power 1/2) x (4 to the power 1/2). That's how it becomes 'which number times itself equals 4?", then the intuition may become a bit clearer. :-)

Anyway, it's great effort.

[cinmilk]

this is driving my brain nuts. i dont understand half of what he is saying.

[hobojoe9127]

see lvl 1 & 2 before seeing this one, or did you?

[Winsunn307]

Very clear, thanks.

[Sconz32]

Where can I find the level 3 practice exercises?

[mlehbleh22]

It's kinda confusing on the last problem... Could you explain a bit further in another video?

[matt3DRC]

what don't you understand in it?

[axtophen]

I have a problem with the second-to-last problem; in all his videos before this one, whenever he converts an integer to a fraction or converts a fraction to it's negative, he makes the numerator the negative number, but in this example, he breaks that rule and makes the denominator the negative number.. why?

[relativeownership]

If you mean (-8)^(-1/3), converting the integer -8 to the fraction -1/8 is just flipping the -8 over by distributing the negative sign in the power. Then, in converting (-1/8)^1/3, he skips a step in that that 1 raised to ANY power is 1. But you still have (1^(1/3))/(-8^1/3), which is the same.

[0THANIEL]

Khan Academy (the page that is not on youtube) has a "free, adaptive math program available here" link that will allow you to work through problems related to the videos.

[vickiormindyb]

How did (4/9)3/2 power become ((4/9)1/2) power?

Could you give me some hint as to how this will relate to Computer Programming? It's not that I don't like it, I'm just wondering how all my Math skills will benefit me after I become an MCSP (computer professional).

I've never seen this work, 'cause my teacher told me higher education in Math would be a waste of my time since I'll "never be able to learn it."

You've already proven THAT theory wrong. Thanks.

[matt3DRC]

I think you meant to say: How did (4/9)3/2 power become ((4/9)^(1/2)*3.

All he did was take out the 3 and put it on the outside of the power, try it, what is 1/2 times 3? You will see it is the same as (4/9)^3/2

[djgiohappy]

Can you help me solve the following?

9^x / 3^x-2

Thank you

[matt3DRC]

Hi, the answer is 27^x, I tried to write the solution here but it wouldn't post the comment for some reason.

[eldominicanboy]

yo, im in algebra 1 and im learning algebra 2, i feel proud of myself lol

[wanderingjew2008]

Keep on a goin'! It's not a matter of genius; genius is a matter of working at learning something to the point that you love it and feel close to it.

[eldominicanboy]

Thank you^

[NiEcY2luv]

It seems in college the professor make math complicated, but your videos make the same they do so simple and clear!

[rdwmt]

as mud

[HighLarious]

Thank you -- I love your videos -- they make things so clear!