is this a function?

- anonymous

is this a function?

- chestercat

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- anonymous

no

- anonymous

haha sorry i still need to attach the file!

##### 1 Attachment

- anonymous

A function need to pass a verticle line test

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- anonymous

i know but i cant tell if this one does.. i graph it on my calculator but its not working

- anonymous

You calculator will only graph the top half

- anonymous

Plot a second function with - infront of it

- 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

I posted the link to my plot, can you see it?

- anonymous

is \[\sqrt{x}-1 \] a function

- anonymous

Yes

- anonymous

- anonymous

ok. the link is only partly blue so i dont think its working

- anonymous

Just copy/paste the whole thing to your address bar

- anonymous

okay now i see it!! but i still cant tell if it is a function. is it?

- anonymous

It is not since it does not pass the verticle line test. Blue(top) and purple plot(bottom)

- 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

y = +- sqrt x is not a function

- anonymous

its +- sqrt x -1 though

- anonymous

well its the same idea

- 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

is it all real numbers**

- anonymous

all real numbers, because there is no reason to restrict the domain

- 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

okay, so is \[\sqrt{x}-1 \] a function or not??? i need a final answer!!!!!!

- anonymous

its a function, but when you have +- , it isn't a function

- anonymous

is 5/9 (F-32) a function

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