anonymous
  • anonymous
is this a function?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
no
anonymous
  • anonymous
haha sorry i still need to attach the file!
1 Attachment
anonymous
  • anonymous
A function need to pass a verticle line test

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anonymous
  • anonymous
i know but i cant tell if this one does.. i graph it on my calculator but its not working
anonymous
  • anonymous
You calculator will only graph the top half
anonymous
  • anonymous
Plot a second function with - infront of it
anonymous
  • anonymous
http://www.wolframalpha.com/input/?i=Plot%5B{Sqrt%5B%28x%2B2%29%2F2%5D%2C-Sqrt%5B%28x%2B2%29%2F2%5D}%5D
anonymous
  • anonymous
I posted the link to my plot, can you see it?
anonymous
  • anonymous
is \[\sqrt{x}-1 \] a function
anonymous
  • anonymous
Yes
anonymous
  • anonymous
http://www.wolframalpha.com/input/?i=Plot%5B{Sqrt%5B%28x%2B2%29%2F2%5D%2C-Sqrt%5B%28x%2B2%29%2F2%5D}%5D
anonymous
  • anonymous
ok. the link is only partly blue so i dont think its working
anonymous
  • anonymous
Just copy/paste the whole thing to your address bar
anonymous
  • anonymous
okay now i see it!! but i still cant tell if it is a function. is it?
anonymous
  • anonymous
It is not since it does not pass the verticle line test. Blue(top) and purple plot(bottom)
anonymous
  • anonymous
My two cent. If a teacher gives you a function, as a equation than it is probably a function. If the teacher graphs it for you than it is probably NOT a function, but in both cases you need to verify it with the vertical line test. It is extremely hard to make an equation that is not a function.
anonymous
  • anonymous
y = +- sqrt x is not a function
anonymous
  • anonymous
its +- sqrt x -1 though
anonymous
  • anonymous
well its the same idea
anonymous
  • anonymous
so for sure it is not a function? also, what is the domain of 3x^2+4x+2? os ot a;; real numbers
anonymous
  • anonymous
is it all real numbers**
anonymous
  • anonymous
all real numbers, because there is no reason to restrict the domain
anonymous
  • anonymous
for example y = 1/x , we cant have division by zero when x = 0, so x=0 is not in the domain. but the rest of real numbers is
anonymous
  • anonymous
okay, so is \[\sqrt{x}-1 \] a function or not??? i need a final answer!!!!!!
anonymous
  • anonymous
its a function, but when you have +- , it isn't a function
anonymous
  • anonymous
is 5/9 (F-32) a function

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