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Domain of a function November 5, 2009

Posted by Domena in : Education , trackback
khanacademy asked:


Figuring out the domain of a function

Comments»

1. NorwegianNightmare88 - November 8, 2009

I think how do you write so good with a mouse on the computer?!?!?!?!?

2. Mejiera12 - November 10, 2009

8bit nice one catching that

3. limon914 - November 13, 2009

Very helpful, thanks!

4. Archer6633 - November 13, 2009

If it only was recorded by a camera.. you would rock..!

5. mack520 - November 16, 2009

hey mon- where do we send money? Paypal?

6. VFCfuturelove1 - November 19, 2009

I think crap I CANT FIND WUT I WANT!!.. so my homework goes a little like this ..Find the range(dependent),R, of every funcion given the domain (independent),D.then here’s #9-f(x)=x(cubed)+3 then to the side D={-3,0,3}..HELP?!?!=[..don't get it..i have 2 turn this in 2morrow..will make sure 2 pay attention in class latr..bt for now HELP PLEASE!!=]

7. jokersnkings - November 22, 2009

hey i have a problem that i reely dont get…..f{x} = kx/3x+5, x does not equal negative 5/3 and f{f{x}} =x satifies f{x} for all real vaulues of x expect negative 5/3 what is the value of k

8. sblackstone - November 24, 2009

What I would like to know is why this is the first result when you search for ‘funions’ on youtube.

9. forensicsbound - November 26, 2009

hey thanks….just outta curiosity, do you have a vid like this on finding range or can you direct me 2 a video on this. Thanks!

10. chevelledude888 - November 29, 2009

this is scary if u read this this far u will die in 10 days if u dont send to any 15 videos in 2 hours SORRY x .

11. exquibble - December 1, 2009

in the last example 1/2 is not an even or odd number but it is a real number. Your domain in this example is wrong.

12. 8bit2008 - December 2, 2009

Forgive me if I’m wrong, but on that last question, isn’t the domain the set of all INTEGERS such that x is not equal to 1?

13. dotageek11 - December 4, 2009

can you find domain and range of y=2x^2-x? thanks a lot.

14. majorkeybaree - December 6, 2009

absolute value?

15. abedbae - December 7, 2009

The last problem was tricky! almost got me :)

16. abedbae - December 10, 2009

I think thanks!

17. buzwazfuz - December 12, 2009

I think thank you, you always get me through my math and physics homework. thx agian

18. jensennn93 - December 12, 2009

thank you sooooo much!

19. sarafann - December 14, 2009

ty, saved my grade :)

20. RoseDelion - December 16, 2009

I think I can’t stand my math teacher, he didn’t teach us this, he just gives us paper, does 1 example. And expects us to get an A+
I need help on how to graph dilations/translations
Thanks your very helpful =)

21. DCaple0013 - December 17, 2009

u have a lot of time to be doing this. thank you tho for real i got this take home quiz and ive been falling behind. good man u r. peace.

22. macardent - December 19, 2009

YOU ARE AWESOME! Now I can hope I get perfect in tomorrows test!

23. khanacademy - December 21, 2009

I think for y=x^2, y is a function of x or y=f(x)=x^2 because if you input any x into the f(x)=x^2, you get a unique value. For x=y^2, x is a function of y for the same reason (x=f(y)=y^2) but y is not a function of x. For x=y^2, if x=4, then y could be +2 or -2 so you don’t get a unique y.

24. levimariah - December 21, 2009

I think Sal; can you help me understand how to determine if a relation is a function or not, like y=x^2 vs. x=y^2 one is a function and one is not,i’m haveing a hard time deciphering the info. also; could f(x) be considered y when x is in the relation? thanks, Tim

25. payasitopimpim2002 - December 24, 2009

instructive useful …..awesome…thanks my friend…………


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