Question

Can anyone help me with domain of a function

Answer 1

Hoot! You just asked your first question! Hang tight while I find people to answer it for you. You can thank people who give you good answers by clicking the 'Good Answer' button on the right!

Answer 2

what do u need help w/? like what it is or how to rite one?

Answer 3

domain is the inverse range divided by three halves

Answer 4

okay, thanks for the answer, but what you just said asd24312 is over my head

Answer 5

to jadegirl390 I need to know how to find the domain of a function. Not the range, just the domain

Answer 6

the domain is the range divided by -1 quantity divided by three halves. Its the quickest way and makes the most sense

Answer 7

oh forget it, i have no idea what that is. im thinking domain as in piecewise functions
sry wifeofD

Answer 8

I have never had algebra before in my life, so I really need help to understand. In plain English instead of math speak.

Answer 9

aww thats cute

Answer 10

??

Answer 11

asd... What? That's absolutely not always the relation of domain and range.

Wifeofd -- the domain of a function depends on the function. Do you have any examples we can work through?

Answer 12

shadowfiend-- p(x)=x to the second power subtract 2x add 5

Answer 13

In essence, the domain of a function is the set of values that x can take on in that function. So in \(y = x^2\), x can be any real number, since you can plug any real number into that equation and get a y value out. In the function \(y = \sqrt{x}\), however, x has to be positive, because the square root of a negative number is not a real number. Thus, in this case, the domain is \(x > 0\).

Answer 14

I barely passed pre-algebra with a D- and the college threw me into algebra and I don't understand anything. I feel so stupid.

Answer 15

\[p(x) = x^2 - 2x + 5\]
That's your function. Basically, ask yourself if there's any value of x that will `break' that function, i.e., can you put in a value where \(x^2\) doesn't work? Where \(2x\) doesn't work?

Answer 16

not sure. I am drawing a blank. Told you I was stupid.

Answer 17

so ur asking what i thought, sry.
so basically this is how my teacher taught us: if someone were to draw a picture of something on a graph using functions and all you wouldn't want the functions to go on forever, rite?
so basically the domain the where you want the function to be. the x values that you want the equation to go through.
does that help anything?

Answer 18

Hehe. No worries. This stuff can be tough at times.

We can break it down a bit with a couple of facts. The domain of \(x^2\), as we said above, is basically any number. The domain of \(2x\), or indeed of \(ax\) for any number \(a\), is also any number. So, there is no restriction on the domain of \(p(x)\).

How you express that depends on what notation your book uses. The set notation way to say it is: \(x \in (-\infty, \infty)\); this means that x can take on any value between negative infinity and positive infinity, i.e. any number. Or, you can say \(x \in \mathbb{R}\), meaning that x is any real number..

Answer 19

shadowfiend and jadegirl--??? I am so lost and confused, I am so sorry. I don't mean to waste your time. I just don't understand. I know that y'all are trying to help, I don't think there is anyone that can help me.

Answer 20

It's okay. The moment when it makes sense is just around the corner :)

What I'm kind of limited by right now is that we can't draw anything on OpenStudy, but since I'm one of the people who builds this site, it's my fault :p

Basically, the function you're asking about works for every value of x, and that is its domain. If a function `doesn't work' -- for example, the square root of a negative number `doesn't work' -- then the domain cannot include those numbers for x.

Answer 21

I am just too stupid in Math. I have no problems with the other subjects, it is just Math that I am left way far behind.

Answer 22

what is a square root?? See, I am dumb as a box of rocks.

Answer 23

kk so here would be my first advice (and i i dont want to sound cheesy and all) but just say that u cud figure this out.
so basically here goes:
a function is like a candy machine (u know what that is ;) if u push the buttton for coke only coke will come out, not grape soda or the like. (or at least it should)
that is the same thing like a function, its like saying when y is # then x is only going to be a number and it'll never be another number.
is that clear so far?

Answer 24

yep, so far jadegirl

Answer 25

I am following

Answer 26

kk sry i was just doing hw.
a line, goes on forever, rite?

Answer 27

one sec
i brb

Answer 28

I am doing hw myself so I know where you are coming from.

Answer 29

kk so basically not necessarily can any number be an answer, for example square roots
so a square root is the opposite of a square, does that make sense?
meaning when u square a number, like 2, so that means you are saying 2*2 so a square root is the opposite of that. its giving u the answer and asking u for the number

Answer 30

does that make sense?

Answer 31

tell me if it doesn't. im just gonna cont.
so basically you can never have a negative square root. i think so that means that (if that is true) that any number that would make that equation has to be a positive number. therefore the only x values (which is another word for domain) have to be positve.
is that clearer?

Answer 32

now that is throwing me off. the problem in my book doesn't include square roots

Answer 33

In the problem that i put up, I changed the numbers, but it is set up the same way.

Answer 34

sry didnt see the problem
so is that basically in the book written
p(x)=x to the second power subtract 2x add 5
p(x)=x^2 (that means raised to the nth pwr)-2x+5?
what r u supposed to do with it?

Answer 35

Find the domain of p

Answer 36

hmmmm is there a graph with the equation?

Answer 37

no, there are multiple choice answers though

Answer 38

ok what r the options? i don't quite understand what they're asking. (is this algebra 1 or 2?) if u look at the back of ur book if this is an odd question they might have the answer, cuz mine does.

Answer 39

I think it is algebra 1

Answer 40

My book doesn't have the answer, unfortunately.

Answer 41

The first day of class, my teacher confiscated the answer chapter in the book.

Answer 42

from everyone in the class....

Answer 43

thats a bummer, oh if u go on classzone.com and type in ur school code (u might have to get it from a teacher or idk ) they have the book online so they might have the answer.
but if not, so what are the multiple choice things?

Answer 44

a) x/x is a real number
b) x/x is a real number and x is greater than 0
c) x/x is a real number and not equal to 10
d) x/x is a real number and not equal to 0

Answer 45

i really wish i cud help more but i have no idea what to do, where even to start (so dont feel stupid :)) i cud ask my teacher if the hw isnt due tom. sry!!!!!!!!!!!!!!!!

Answer 46

Unfortunately it is due to be scanned and emailed in by midnight tonight. thanks anyway for trying

Answer 47

ahhhhhhhhhhhhhh gluck!!!!!!!!!!!!!!!!!!

Answer 48

I don't feel stupid really, I know I am stupid.

Answer 49

wai ti just thought of something.
so a doesn't make sense (unlss the book is trying to trick u ) because all the other choices r real numbers too

Answer 50

is there another equation on top of this one?