Tutor.com Quadratic Functions Session

Jul. 5, 2012

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Session Transcript - Math - Algebra II, 6/28/2012 10:46PM - Tutor.comSession Date: 6/28/2012 10:46PM
Length: 19.1 minute(s)
Subject: Math - Algebra II


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

Guest (Customer) (Customer)
[00:00:00] find the roots

ELIZABETH C (Tutor)
[00:00:36] hi. you will need to factor. there are lots of methods for factoring. have you been factoring in class?

Guest (Customer) (Customer)
[00:00:52] yes

ELIZABETH C (Tutor)
[00:01:23] what method have you been using?

Guest (Customer) (Customer)
[00:03:05] dont remember the name but we found the factors that had to add to the middle term

ELIZABETH C (Tutor)
[00:04:28] ok. i will show an ac/b chart.
[00:04:48] can you tell me what a, b, and c equal?
[00:06:23] very close. just a couple of things...
[00:06:33] first, leave x out of this part
[00:07:21] second, what is the number that we don't write down that is really in front of x^2?

Guest (Customer) (Customer)
[00:07:40] 1

ELIZABETH C (Tutor)
[00:07:49] yes...good
[00:08:53] "c" needs one little correction. what is the sign in front of the 18?
[00:09:11] good
[00:09:19] what is a times c?

Guest (Customer) (Customer)
[00:09:46] -18

ELIZABETH C (Tutor)
[00:10:00] good and what is b?

Guest (Customer) (Customer)
[00:10:19] -7

ELIZABETH C (Tutor)
[00:10:52] on the left we list factors of -18 and we are looking for the pair that adds up to -7
[00:11:04] example...
[00:11:55] are there any other factor pairs?

Guest (Customer) (Customer)
[00:12:18] 9 and 2

ELIZABETH C (Tutor)
[00:12:48] yes... but because 18 is negative... one of them will need to be -
[00:13:27] what is -9+2?
[00:13:44] good
[00:14:20] if a=1 which it did, we just set up () () and put our factors in like so...
[00:14:57] then our factor pair goes at the back of each ()
[00:15:53] and we are almost finished. set each factor = 0 and solve each one separately. can you do that?
[00:17:59] those are the roots and those are your answers. do you understand this problem now?

Guest (Customer) (Customer)
[00:18:18] yes I understand

ELIZABETH C (Tutor)
[00:18:53] gr8. well, i guess i will let you go. don't forget the survey. and have a gr8 math class next time