Nick88888888
  • Nick88888888
find the domain function of f(x) =
Mathematics
chestercat
  • chestercat
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Nick88888888
  • Nick88888888
|dw:1436769998922:dw|
anonymous
  • anonymous
IS this whole thing equal to y?
Nick88888888
  • Nick88888888
what do you mean .-.?

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anonymous
  • anonymous
The domain is restricted by the radicand
anonymous
  • anonymous
x+3>0
anonymous
  • anonymous
x>-3 Domain has to be [-3,oo)
Astrophysics
  • Astrophysics
\[x \ge - 3\]
Astrophysics
  • Astrophysics
\[[ { x \in \mathbb{R} : x \ge -3 } ]\] should be squiggly brackets but oh well
Nick88888888
  • Nick88888888
@Deeezzzz @Astrophysics ok so it gives me 4 options which is x ≥ 0 , All Real Numbers , x ≥ 1 , x > 0
Nick88888888
  • Nick88888888
and ive looked at how to do this on other sites and it kept giving me ∈R stuff :/
Astrophysics
  • Astrophysics
That is called set builder notation, you should really learn it, will not take you long http://www.mathsisfun.com/sets/set-builder-notation.html
Astrophysics
  • Astrophysics
Your options aren't useful as it's giving symbols, just take image of your question and post it
Nick88888888
  • Nick88888888
Astrophysics
  • Astrophysics
I'm not sure what those symbols mean, and those answers do not make sense to me, maybe someone else can explain the significance of those symbols? @ganeshie8 perhaps
Astrophysics
  • Astrophysics
Ah zz is here, maybe he can help
zzr0ck3r
  • zzr0ck3r
\(\sqrt[3]{-1}=-1\)
zzr0ck3r
  • zzr0ck3r
i.e. there are no domain restrictions
zzr0ck3r
  • zzr0ck3r
Does this make sense?
Astrophysics
  • Astrophysics
I think you maybe thinking of \[(x+3)^3-1\]
ganeshie8
  • ganeshie8
\[\large f(x) = \sqrt[3]{~x~}\] the usual definition is for all real numbers
Astrophysics
  • Astrophysics
That was my initial thought, until I wolframmed it xD
Astrophysics
  • Astrophysics
But in any case, what are the other symbols?
ganeshie8
  • ganeshie8
definitely not math, they look chinese to me
Nick88888888
  • Nick88888888
Lol
zzr0ck3r
  • zzr0ck3r
I am not thinking about x^3, I am thinking of the cube root. \(\sqrt[a]{x}\) has domain all real numbers for all a odd, if a is even then it cant be negative
Astrophysics
  • Astrophysics
Oh ok, I thought it was some other way for interval notation
zzr0ck3r
  • zzr0ck3r
It is just him coping from something that is not latex...
Astrophysics
  • Astrophysics
Haha, alright thanks zz and ganeshie
zzr0ck3r
  • zzr0ck3r
I am guessing one should say \(x\ge 1\)

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