# Tutor.com Polynomials Session

##### Sep. 10, 2012

Session Transcript - Math - Algebra II, 9/9/2012 10:16PM - Tutor.comSession Date: 9/9/2012 10:16PM
Length: 16.1 minute(s)
Subject: Math - Algebra II

System Message
[00:00:00] *** Please note: All sessions are recorded for quality control. ***

Bryan (Customer)
[00:00:00] hi

Jackie G (Tutor)
[00:00:17] hi and welcome to tutor.com ! how can I help you?

Bryan (Customer)
[00:00:27] hi
[00:00:42] I had a problem on my quiz I want to check to see If i got it right
[00:00:45] the problem is
[00:00:51] find the domain of this
[00:01:33] i think this was it
[00:01:41] not sure if it also had
[00:01:44] this
[00:01:57] yea
[00:02:03] this was it pretty sure

Jackie G (Tutor)
[00:02:15] ok, what was your first step when you did the problem?

Bryan (Customer)
[00:02:31] is the answer all real number except x cannot equal 9
[00:02:38] numbers

Jackie G (Tutor)
[00:03:03] ok, the x cannot equal 9 part is correct, but let's look at the top of the function

Bryan (Customer)
[00:03:09] oh noooooo
[00:03:13] I was afraid of that
[00:03:41] also -4/3?

Jackie G (Tutor)
[00:04:00] it's ok, you atleast got half credit on the problem, and yes, you're close on the -4/3 part.
[00:04:08] can you tell me where you got that number from?
[00:04:53] ok, so can you tell me why you set that part of the equation equal to 0?

Bryan (Customer)
[00:05:02] not sure

Jackie G (Tutor)
[00:05:24] that's the part of the equation that is under the square root, do you remember any limitations a square root has?

Bryan (Customer)
[00:05:34] cannot be neg?

Jackie G (Tutor)
[00:06:01] yes! so that means 3x+4 has to be greater than what number?

Bryan (Customer)
[00:06:06] 0

Jackie G (Tutor)
[00:06:29] Right, so how can we modify your equation on the white board?
[00:07:12] yes! but can we take the square root of 0?

Bryan (Customer)
[00:07:22] can we?

Jackie G (Tutor)
[00:07:39] well what times itself is zero?

Bryan (Customer)
[00:07:51] 0

Jackie G (Tutor)
[00:08:03] yep! so we can take the square root of zero
[00:08:13] does that change your equation on the white board?
[00:08:21] never mind, you already did it, good job!

Bryan (Customer)
[00:09:07] is that right?

Jackie G (Tutor)
[00:09:12] yes, very good!

Bryan (Customer)
[00:09:18] parenthese after 9?
[00:09:23] not braket

Jackie G (Tutor)
[00:09:29] yep! you've got it

Bryan (Customer)
[00:09:36] so would I box this
[00:09:37] or
[00:09:43] say domain:
[00:09:47] and then write this

Jackie G (Tutor)
[00:10:03] yes, that is exactly what you would do.
[00:10:19] sorry you didn't get it quite right on your quiz, but at least you know how to do it now

Bryan (Customer)
[00:10:27] pretty annoyed
[00:10:30] no
[00:10:31] thanks
[00:10:48] i was about to do it

Jackie G (Tutor)
[00:10:56] ok, well have a good night, and if you have time i would appreciate it if you could fill out the survey at the end, thanks!

Bryan (Customer)
[00:10:56] and then didnt
[00:10:58] so
[00:11:05] always with square roots do this?

Jackie G (Tutor)
[00:11:23] yes, whenever there is a square root, set what is inside it greater than or equal to 0

Bryan (Customer)
[00:11:37] what if this was flipped
[00:11:52] what would the answer b
[00:11:53] be

Jackie G (Tutor)
[00:12:32] then you would not be able to have 0 on the bottom, so you would set what is inside the square root greater than 0.

Bryan (Customer)
[00:12:49] so would be the same just 9 would be ok

Jackie G (Tutor)
[00:13:10] yes, also you could not have -4/3 in the domain, so that would be a parenthesis

Bryan (Customer)
[00:13:28] so it would be
[00:13:38] ?

Jackie G (Tutor)
[00:13:55] is that a bracket or parenthesis on the left side?

Bryan (Customer)
[00:14:04] bracket

Jackie G (Tutor)
[00:14:37] it should be a parenthesis, because we would not want 0 on the bottom of the fraction, and -4/3 would make what is inside the square root 0. does that make sense?

Bryan (Customer)
[00:14:56] ok
[00:15:05] but is it ok to have 0 on the top?

Jackie G (Tutor)
[00:15:15] yes, that is ok
[00:15:36] do you have any more questions?

Bryan (Customer)
[00:15:39] no got it
[00:15:40] thanks

Jackie G (Tutor)
[00:16:03] yep no problem! and again, if you have time, i would love it if you could fill out the survey, thanks!