Question

is this a function?

Answer 1

no

Answer 2

haha sorry i still need to attach the file!

Answer 3

A function need to pass a verticle line test

Answer 4

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

Answer 5

You calculator will only graph the top half

Answer 6

Plot a second function with - infront of it

Answer 7

http://www.wolframalpha.com/input/?i=Plot%5B {Sqrt%5B%28x%2B2%29%2F2%5D%2C-Sqrt%5B%28x%2B2%29%2F2%5D}%5D

Answer 8

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

Answer 9

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

Answer 10

Yes

Answer 11

http://www.wolframalpha.com/input/?i=Plot%5B {Sqrt%5B%28x%2B2%29%2F2%5D%2C-Sqrt%5B%28x%2B2%29%2F2%5D}%5D

Answer 12

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

Answer 13

Just copy/paste the whole thing to your address bar

Answer 14

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

Answer 15

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

Answer 16

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.

Answer 17

y = +- sqrt x is not a function

Answer 18

its +- sqrt x -1 though

Answer 19

well its the same idea

Answer 20

so for sure it is not a function? also, what is the domain of 3x^2+4x+2? os ot a;; real numbers

Answer 21

is it all real numbers**

Answer 22

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

Answer 23

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

Answer 24

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

Answer 25

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

Answer 26

is 5/9 (F-32) a function