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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