Comments on: Domain of a function

By: payasitopimpim2002

payasitopimpim2002 — Sun, 27 Dec 2009 07:16:09 +0000

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

By: levimariah

levimariah — Sun, 27 Dec 2009 03:57:31 +0000

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

By: khanacademy

khanacademy — Fri, 25 Dec 2009 11:21:02 +0000

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.

By: macardent

macardent — Thu, 24 Dec 2009 23:54:24 +0000

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

By: DCaple0013

DCaple0013 — Wed, 23 Dec 2009 11:39:09 +0000

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.

By: RoseDelion

RoseDelion — Mon, 21 Dec 2009 21:39:11 +0000

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 =)

By: sarafann

sarafann — Sun, 20 Dec 2009 17:53:17 +0000

I think ty, saved my grade

By: jensennn93

jensennn93 — Sun, 20 Dec 2009 04:36:04 +0000

thank you sooooo much!

By: buzwazfuz

buzwazfuz — Sat, 19 Dec 2009 07:28:40 +0000

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

By: abedbae

abedbae — Fri, 18 Dec 2009 02:32:25 +0000

I think thanks!