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/sci/ - Science & Math

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3952099 No.3952099 [Reply] [Original]

(9x^3-x-3) / (3x+2)

Help.
Need to use long division.

>> No.3952112

>>3952099

Write what you have done.

>> No.3952118 [DELETED] 

>>3952112
why? this isnt a confessional booth, i just want you fags to do my homework for me

>> No.3952129
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3952129

Every time I've learned algebraic long division, I've forgotten within 12 hours after taking the last test.
Even in Cal III we don't use it that much. And usually if something looks like it might need long division, you can manipulate by factoring.

>> No.3952134

>>3952112
That is what I have -.-

>> No.3952164

>>3952099

What's the problem? Just remember that when you have a lead coefficient to a power of 3 and the next given coefficient is a power of 1 there must be a coefficient to the power of 2 in between, even if that coefficient is a 0.

So, in your division bracket, write this:

9x^3 + 0x^2 - x - 3

Divide by 3x + 2.

Answer should be 3x^2 - 2x + 1 - (6 / 3x+2) or something like that. Did it in my head so the math might be off.

>> No.3952171

>>3952164

er... -5 / 3x+2 that remainder should be.

>> No.3952175

>>3952118
...
you are the very essence of why /sci/ hates homework boards.

>> No.3952177

without long division:
(9x3-x-3)=(3x+2)*(3x²+bx+c)
2*c=-3 => c=-3/2
therfore 9x^3-x-3=(3x+2)*(3x²+bx-3/2)
replace x with 1:
9-1-3=5*(3+b-3/2) <=> 3+b-3/2=1 <=>b=-1/2
so (9x^3-x-3)/(3x+2)=3x²-x/2-3/2
posting long division method now

>> No.3952179

>>3952175

/sci/ LOVES homowork threads

>> No.3952199

>>3952099
>>3952118
>i just want you fags to do my homework for me
you're a piece of shit, OP. reported

>> No.3952206

>>3952199
lol. EK is too smart to see that 3852118 isn't OP.

>> No.3952211

>>3952206
You don't see the fine meta-trolling.
EK is more intelligent than you might think.

>> No.3952217

>>3952211
>EK
>chick
>sudies zoology
>smart
I don't think so.

>> No.3952229

>>3952217
Don't you force me to white knight.

>> No.3952232
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3952232

>>3952206
>>3952211
FUCK!
i didnt realise OP actually used a name,
motherfucker!
erm, >118 is actually me, i was trolling. if you dont believe me i can prove it by deleting >118 at exactly 15:32

>> No.3952236

>>3952232
my mind is blown

>> No.3952245

>>3952229
considering >3952232
let's call it a draw

>> No.3952247
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3952247

>>3952175
lol, that guy didnt notice either...

>> No.3952250

>>3952247
that guy was probably also you

>> No.3952260

>>3952250
honestly wasn't
>homework boards
*threads
like i'd make that kind of mistake...

>> No.3952272

This whole thread is EK even this

>> No.3952282

deleting >118
standby...

>> No.3952286

>>3952272
I wish that whole board was EK.

>> No.3952298

use the galley method (sp?)
http://www.youtube.com/watch?v=V-Q6jBYn3Oc
it's pretty much the same as logn division but it's more intuitive