Question

http://prntscr.com/4cipxt

Answer 1

@satellite73

Answer 2

A function is not defined if there is division by zero.

Answer 3

yes

Answer 4

i got that :)

Answer 5

:) Also, if there is a negative under an even radical, the function becomes imaginary.

Answer 6

But I think it is still defined...

Answer 7

ok

Answer 8

But according to that train of thought, none of the answers are correct. So I think we need to assume that negatives under even radicals are undefined as well.

Answer 9

ok?

Answer 10

What values of x make a negative under the numerator radical?

Answer 11

Hm, none of the answers are working out even if you make that assumption!

Answer 12

What class is this problem from?

Answer 13

letme take a sreen shot :)

Answer 14

it loading :)

Answer 15

so you take white board classes?

Answer 16

Um, I give classes on whiteboards. :) Is that what you mean?

Answer 17

yea :)

Answer 18

Yup :)

Answer 19

online whiteboard

Answer 20

done http://prntscr.com/4cj4j9

Answer 21

Right.

Answer 22

Yeah, I don't get any of those answers. I get x<1.

Answer 23

what about D?

Answer 24

Because that makes the top radical negative. And it is where the denominator radical is 0.

Answer 25

Oh!!! I was reading it as undefined, not defined! My bad!

Answer 26

ok so what would it be?

Answer 27

nope B :(

Answer 28

B

Answer 29

:p too late lol

Answer 30

It is undefined for x<1, and defined for x>=1

Answer 31

Does it make sense though?

Answer 32

um i don't get it that much with x>1 and those signs

Answer 33

Do you understand that the denominator makes it so that 0 is an undefined value for x?

Answer 34

yes that part I do

Answer 35

Ok, cool.

Answer 36

o so it is asking what way is correct

Answer 37

i got another question

Answer 38

http://prntscr.com/4cj8h3

Answer 39

It is asking which numbers, when you plug them in for x, you get real solutions.

Answer 40

ohhh ok

Answer 41

:) Same thing for this one.

Answer 42

What numbers can you plug in for x and get something real?

Answer 43

1?

Answer 44

Yuo, 1 works. Does that help you eliminate any of the answer choices?

Answer 45

all except for B?

Answer 46

Hm, how did you get that?

Answer 47

the only 1 is B ?

Answer 48

We decided so far that 1 for x makes the function defined. So that means that any answer that does not include 1 can't be the right answer.

Answer 49

B doesn't include 1.

Answer 50

So that can't be the right answer.

Answer 51

x<1 means all numbers that are less than 1.

Answer 52

k

Answer 53

Does A include 1?

Answer 54

no?

Answer 55

x>0 means all numbers that are greater than 0. Is 1 greater than 0?

Answer 56

yes

Answer 57

O:

Answer 58

ok!!

Answer 59

so its A!!!

Answer 60

Right! :)

Answer 61

xD

Answer 62

I think you need to review inequalities :)

Answer 63

?

Answer 64

x>0, x<-1 These are examples of inequalities that you didn't seem to understand what they meant.

Answer 65

oh ok

Answer 66

That is a prealgebra concept and you are expected to know how to use them in alg II.

Answer 67

<.>

Answer 68

k

Answer 69

Happy studies! :)