Tutor.com Quadratic Equations Session

Apr. 30, 2013

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Session Transcript - Math - Algebra, 4/10/2013 8:31PM - Tutor.comSession Date: 4/10/2013 8:31PM
Length: 21.2 minute(s)
Subject: Math - Algebra

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

Guest (Customer)
[00:00:00] x^2-12x+27=0
[00:00:12] HI

Rida Z (Tutor)
[00:00:15] Welcome to Tutor.com, How are you today?
[00:01:01] So, what are the directions for this problem
[00:01:48] Are you with me ?

Guest (Customer)
[00:02:08] Quadratic formula..it just says to solve?

Rida Z (Tutor)
[00:02:32] Oh Alright, so we are supposed to use the quadratic formula to find out what X equals to ?

Guest (Customer)
[00:02:48] Yes..

Rida Z (Tutor)
[00:03:01] Awesome, so do you know what the quadratic formula looks like ?
[00:03:58] That is the standard format of the quadratic equation
[00:04:06] Do you know the quadratic formula used to solve for X ?

Guest (Customer)
[00:04:35] no sir

Rida Z (Tutor)
[00:04:48] Alright, let me go ahead and write it up on the board...

Guest (Customer)
[00:05:13] oh ok yeah I remember..

Rida Z (Tutor)
[00:05:20] very good
[00:05:29] So we are going to use this formula to get our X values
[00:05:37] Do you know what our "b" is ?
[00:05:54] Right!
[00:06:14] Not quite. the "X" is not part of "b"
[00:06:24] B is only the coefficient of the middle "x"

Guest (Customer)
[00:06:36] O ok..

Rida Z (Tutor)
[00:06:43] Remember the formula starts with a negative sign, so you have to keep that in the formula

Guest (Customer)
[00:07:03] Ok..

Rida Z (Tutor)
[00:07:13] go ahead, try to fill the rest of the formula
[00:07:25] very good
[00:07:45] Not quite... the "A" is not x^2
[00:07:59] It is the coefficient of "x^2" so what would "A" be ?

Guest (Customer)
[00:08:28] 1?

Rida Z (Tutor)
[00:08:34] Correct!
[00:08:52] Then go ahead and do the bottom part of the formula
[00:09:55] replace the "A" with it s value

Guest (Customer)
[00:10:26] Can I just leave it blank since the A won't change the answer..

Rida Z (Tutor)
[00:10:42] Right, it won't but its usually a good idea to get in the habit of writing it down anyways
[00:10:55] Do you understand the process of solving the problem so far ?

Guest (Customer)
[00:11:15] Yeah so far I'm following well..

Rida Z (Tutor)
[00:11:33] Good!
[00:11:44] Now go ahead and simplify the formula, where do we start?
[00:12:12] good
[00:12:55] Well... where did you get the 36 - 2 ?

Guest (Customer)
[00:13:10] one sec let me do the multi.

Rida Z (Tutor)
[00:13:16] ok sure
[00:13:57] Hmmm... That is not quite correct
[00:14:05] (-12)^2 is not 36..

Guest (Customer)
[00:14:36] Ok i did pemdas out of order I divided by 2 and then exponented..
[00:14:38] ok

Rida Z (Tutor)
[00:14:54] No that would not be a good idea.. we must follow pemdas... we must do exponents first
[00:15:04] and do not consider the bottom "2" right now, it will be the very end.
[00:15:16] only simplify what is inside the radical right no
[00:15:19] now*
[00:16:01] Be careful, when ever you square a number, it will never come out negative, because *negative times negative* = positive

Guest (Customer)
[00:16:44] ok..

Rida Z (Tutor)
[00:16:57] go ahead and do the other half
[00:17:03] what does that come out to be?
[00:17:15] Very good!
[00:17:22] so what is 144 - 108?

Guest (Customer)
[00:17:41] 36

Rida Z (Tutor)
[00:17:45] Very good!
[00:17:56] awesome
[00:18:05] So, what do we do next ?
[00:18:19] very good!
[00:18:46] Not quite, you cannot divide by 2 before you solve the top portion
[00:18:59] wait, hold on
[00:19:01] nevermind
[00:19:06] You split the two
[00:19:31] So what would it come out to be ? the x values?
[00:19:56] CorrecT! x = 9 and 3
[00:20:30] So we have solved the quadratic equation using the quadratic formula, do you have questions over any of the steps that we went over?

Guest (Customer)
[00:20:31] Thanks!

Rida Z (Tutor)
[00:20:40] You're welcome

Guest (Customer)
[00:21:02] No I understand..Thank you so much I should have it from here..
[00:21:06] Be good.

Rida Z (Tutor)
[00:21:09] Awesome