# Tutor.com Quadratic and Exponential Functions Session

##### Jun. 5, 2012

Session Transcript - Math - Algebra, 6/4/2012 8:48PM - Tutor.comSession Date: 6/4/2012 8:48PM
Length: 26.6 minute(s)
Subject: Math - Algebra

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

Guest (Customer)
[00:00:00] like what i did wrong in my steps.

Constance G (Tutor)
[00:00:12] Welcome to Tutor.com ! Hi

Guest (Customer)
[00:00:16] hey

Constance G (Tutor)
[00:00:32] why don't you show me what you did.

Guest (Customer)
[00:00:41] so im going to solve it and you can tell me what i did wrong ok

Constance G (Tutor)
[00:00:52] that would be fine
[00:02:02] doing fine
[00:02:27] good

Guest (Customer)
[00:02:39] so its right?

Constance G (Tutor)
[00:02:47] the math is correct.

Guest (Customer)
[00:03:03] well i think i have to check it if u know what i mean

Constance G (Tutor)
[00:03:08] You always need to check your answer when squaring due to extraneous roots.

Guest (Customer)
[00:03:12] that could be why i got it wrong maybe idk

Constance G (Tutor)
[00:04:12] so the 84 doesn't work.

Guest (Customer)
[00:04:13] no it doesnt check
[00:04:20] so then it would be no soulution/
[00:04:23] ?

Constance G (Tutor)
[00:04:30] that is an extraneous root. You are correct, no solution.

Guest (Customer)
[00:04:44] yay
[00:05:02] yeah my teacher also told me its called extraneous root

Constance G (Tutor)
[00:05:05] This is the reason you always check those answers because the squaring sometimes creates answers that do not work
[00:05:27] Everything you did was perfect
[00:05:33]

Guest (Customer)
[00:05:33] ohh okay i gotcha and so if it does work then u just leave the remaining answer/
[00:05:34] ?

Constance G (Tutor)
[00:05:47] you just say no solution.

Guest (Customer)
[00:05:48] haha thankyouu i feel smart now

Constance G (Tutor)
[00:05:55] great.
[00:06:07] glad I could clear that up for youl

Guest (Customer)
[00:06:09] no no i meant in general if the soulution does wokr then u leave it like that right?

Constance G (Tutor)
[00:06:59] If the answer doesn't work you say it is extraneous, if you have more than one answer sometimes one will work and another won't
[00:07:32] In this case your only answer doesn't work, so you can say no solution. or just an extraneous answer

Guest (Customer)
[00:07:46] ohkay i gotcha
[00:07:59] thankyou so much do u have time fo rone more/
[00:08:00] ?
[00:08:06] one*

Constance G (Tutor)
[00:08:08] I think we do.

Guest (Customer)
[00:08:18] alright

Constance G (Tutor)
[00:09:25] good start

Guest (Customer)
[00:09:34] thankss

Constance G (Tutor)
[00:10:04] good idea
[00:10:45] careful you missed a piece

Guest (Customer)
[00:11:04] hmm okay let me think

Constance G (Tutor)
[00:11:20] what did you forget to do?

Guest (Customer)
[00:11:25] subtract?

Constance G (Tutor)
[00:11:30] no
[00:11:35] that step was okay.

Guest (Customer)
[00:11:34] ohhh
[00:11:40] my 24
[00:11:47] waitt nvrm

Constance G (Tutor)
[00:11:54] what did you forget to do to the 24?

Guest (Customer)
[00:12:04] divide by 4/
[00:12:06] ?

Constance G (Tutor)
[00:12:09] righrt

Guest (Customer)
[00:12:14] lol ok

Constance G (Tutor)
[00:12:34] much better
[00:13:15] awesome

Guest (Customer)
[00:13:20] so now i can check?

Constance G (Tutor)
[00:13:25] correct

Guest (Customer)
[00:13:26] thnaks
[00:13:28] oki

Constance G (Tutor)
[00:14:20] ??
[00:14:47] where did 13 come from, look at your original problem

Guest (Customer)
[00:15:03] ok
[00:15:25] now what do i do divide by 4?

Constance G (Tutor)
[00:15:37] I think you are using parts of the last problem. look at the top of the board

Guest (Customer)
[00:16:11] where/
[00:16:12] ?
[00:16:42] yeah so it negative 13
[00:16:47] ohh
[00:16:49] waitt
[00:16:52] positive 13

Constance G (Tutor)
[00:16:58] There isn't a 13 in the problems

Guest (Customer)
[00:17:07] ohhhhh

Constance G (Tutor)
[00:18:16]

Guest (Customer)
[00:18:30] did i do something wrong again/

Constance G (Tutor)
[00:18:47] you are still missing a piece of the original problem'

Guest (Customer)
[00:19:13] oh is it 23/
[00:19:15] ?

Constance G (Tutor)
[00:19:22] RIGHT !
[00:19:35] thank you

Guest (Customer)
[00:19:52] no probs , soorry i feel dumb

Constance G (Tutor)
[00:20:06] now you can finish the check..it would not have worked before.

Guest (Customer)
[00:20:14] ok

Constance G (Tutor)
[00:21:08] don't square here...just do the math as is
[00:21:25] remember you are checking not solving

Guest (Customer)
[00:21:28] ohhh
[00:21:51] okay id ont get it

Constance G (Tutor)
[00:22:11] what is 3times 11 plus 3 ?

Guest (Customer)
[00:22:15] 35
[00:22:18] 36

Constance G (Tutor)
[00:22:29] and the square root of 36?

Guest (Customer)
[00:22:37] 6

Constance G (Tutor)
[00:22:44] does it check?

Guest (Customer)
[00:22:42] so its not a solution
[00:22:45] nopeee
[00:23:05] i forgot to do the squareroot of 36

Constance G (Tutor)
[00:23:12] look again..does the answer of 11 work.

Guest (Customer)
[00:23:36] yes
[00:24:39] so it workss

Constance G (Tutor)
[00:24:44] you have to take the square root of the left and yes it equals the right so 11 is a solution

Guest (Customer)
[00:24:52] got it i dint know u had to take the square root

Constance G (Tutor)
[00:25:12] yes..do all the math on the left and compare to the right.

Guest (Customer)
[00:25:34] okay gotcha
[00:25:38] thank youu

Constance G (Tutor)
[00:25:45] you are welcome'
[00:25:50] it was my pleasure.
[00:25:56]
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Guest (Customer)
[00:26:03]
[00:26:07] byeeee

Constance G (Tutor)
[00:26:10] have a good evening

Guest (Customer)
[00:26:11] have a grwat dayy
[00:26:15] greatt

Constance G (Tutor)
[00:26:18] you too

Guest (Customer)
[00:26:19] thnks