Tutor.com Polynomials Session

Aug. 26, 2013

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Session Transcript - MTH/117 - MTH/117, 8/25/2013 3:13PM - Tutor.comSession Date: 8/25/2013 3:13PM
Length: 16.2 minute(s)
Subject: MTH/117 - MTH/117


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

KRISTOPHER (Customer)
[00:00:00] I'm stuck... the problem is 8x^3+32x^2+8x+32. Factor completely. I've pulled out 8x as the GCF an gotten 8x(x^2+4x+5) then mn=c and M+n=b so mn = 5 and m+n = 4. but that would have to be 5 and -1... but the polynomial is all positive so I don't know what I'm doing wrong

Stephanie K (Tutor)
[00:00:07] Welcome to Tutor.com ! How can I help you today?

KRISTOPHER (Customer)
[00:00:33] hi stephanie. I'm having a mental block.
[00:00:39] can you see my origianl question?
[00:00:47] I'm stuck... the problem is 8x^3+32x^2+8x+32. Factor completely. I've pulled out 8x as the GCF an gotten 8x(x^2+4x+5) then mn=c and M+n=b so mn = 5 and m+n = 4. but that would have to be 5 and -1... but the polynomial is all positive so I don't know what I'm doing wrong

Stephanie K (Tutor)
[00:00:56] I can, but thanks!

KRISTOPHER (Customer)
[00:01:04] np.

Stephanie K (Tutor)
[00:01:53] One thing I'm noticing is the GCF and factoring 8x out of the 32.

KRISTOPHER (Customer)
[00:02:31] hmmm... is that not correct?

Stephanie K (Tutor)
[00:03:16] Since 32 doesn't have an x, 8x wouldn't be a factor of 32. But you could still factor out 8.

KRISTOPHER (Customer)
[00:03:32] omg... what a goof ball...
[00:03:50] I've been staring at this dang computer for too long!!
[00:04:05] ok.. lemme try.. can I write on that screen liek you did?

Stephanie K (Tutor)
[00:04:10] No problem!
[00:04:13] And yes, go ahead!
[00:05:28] That's what I got!

KRISTOPHER (Customer)
[00:05:46] cool. so then I need to factor a bit further. lemme see what I get

Stephanie K (Tutor)
[00:06:17] Okay.

KRISTOPHER (Customer)
[00:06:39] oh... wait... I don't think I can factor an y further... I think I'm done.
[00:07:27] that's the final answer, isn't it?

Stephanie K (Tutor)
[00:07:36] Okay, let me double-check that.

KRISTOPHER (Customer)
[00:08:30] oh, maybe I could do some grouping

Stephanie K (Tutor)
[00:08:37] Right!
[00:09:02] I was able to factor further using grouping.
[00:11:12] That's not quite what I got.

KRISTOPHER (Customer)
[00:11:22] dang.

Stephanie K (Tutor)
[00:11:51] Is that how you grouped them?

KRISTOPHER (Customer)
[00:11:54] yes

Stephanie K (Tutor)
[00:12:03] And then what did you factor out of the first parentheses?

KRISTOPHER (Customer)
[00:12:15] x
[00:12:23] oh!!! I should have done x^2

Stephanie K (Tutor)
[00:12:35] Yup, good job!
[00:13:20] So then what do you have for the factored form?

KRISTOPHER (Customer)
[00:13:47] i feel like i should factor out the (x+4)

Stephanie K (Tutor)
[00:13:52] Right!
[00:14:15] So the last factor is?

KRISTOPHER (Customer)
[00:14:42] 8 (x+4)(x^2+1)

Stephanie K (Tutor)
[00:14:58] Good job! That's what I got as well.

KRISTOPHER (Customer)
[00:15:24] whew! that was tricky. thanks for the help. I need to slow down a bit and pay mor attention

Stephanie K (Tutor)
[00:15:48] You're welcome!

KRISTOPHER (Customer)
[00:15:48] talk to you later, and thanks again.

Stephanie K (Tutor)
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