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VCE Stuff => VCE Mathematics => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Mathematical Methods CAS => Topic started by: jashaan on September 25, 2018, 08:45:54 pm

Title: PLEASE HELP SIMPLE QUESTION but i just don't get it
Post by: jashaan on September 25, 2018, 08:45:54 pm
Hi guys,
I am headstarting methods so idk what  R+ ∪{0} means:((
please help me someone!! when do you use this and how do you what the corresponding range of implied domain is??

thank youu xx
Title: Re: PLEASE HELP SIMPLE QUESTION but i just don't get it
Post by: S200 on September 25, 2018, 08:50:19 pm
Basically, all positive real numbers, with the inclusion of zero...

Depending on what the equation is, the range will change...
Sorry, I read that wrong. The range of the implied domain is asking you "For what set of x values is this function defined", and if no domain is given, the maximal domain becomes the implied domain.


Here's some basic set algebra for you.. :D
Spoiler

The overall set of real numbers....
(https://2012books.lardbucket.org/books/beginning-algebra/section_04/7e7ca15b2f81de4279ba6a613c7bc4de.jpg)
Title: Re: PLEASE HELP SIMPLE QUESTION but i just don't get it
Post by: jashaan on September 25, 2018, 09:02:25 pm
Quote from: S200 on September 25, 2018, 08:50:19 pm
Basically, all positive real numbers, with the inclusion of zero...

Depending on what the equation is, the range will change...
Sorry, I read that wrong. The range of the implied domain is asking you "For what set of x values is this function defined", and if no domain is given, the maximal domain becomes the implied domain.


Here's some basic set algebra for you.. :D
Spoiler

The overall set of real numbers....
(https://2012books.lardbucket.org/books/beginning-algebra/section_04/7e7ca15b2f81de4279ba6a613c7bc4de.jpg)


oh okay but why is it for question i - the range is including 0, then infinity (0, positive infinity)... not the R+ U (0) when it could be that? if you get what i mean
Title: Re: PLEASE HELP SIMPLE QUESTION but i just don't get it
Post by: S200 on September 26, 2018, 08:01:05 am
Hmm...
I guess it's just easier to use the set notation of [0,\(\infty\)) than going all the \(\mathbb{R}^+ \cup{\{0\}}\)