Help Me With Math?

**Kibblre** · 10-22-2009, 03:15 PM

I really don't know how to approach this problem, can somebody help me out?

Solve for x:

(x + 2)!
-------- = 9(x + 2)
x!

**Vanilla Mnm** · 10-22-2009, 03:16 PM

(x + 2)!
-------- = 9x + 18
x!

**Zipsnine** · 10-22-2009, 03:16 PM

Ok you wrote that weird. Is that supposed to be (x+2)/x=9(x+2)?

stargroup · 10-22-2009, 03:17 PM

well first you have to expand the factorial terms

(x + 2)(x + 1)(x)(x - 1)(x - 2)...
------------------------------- = 9(x + 2)
(x)(x - 1)(x - 2)...

I think you can take it from here

MrRubix · 10-22-2009, 03:19 PM

(x + 2)!
-------- = 9(x + 2)
x!

(x + 2)!
-------- = 9
x!(x + 2)

(x + 1)!
-------- = 9
x!

x + 1 = 9

x = 8

MrRubix · 10-22-2009, 03:19 PM

PS you all suck at math

stargroup · 10-22-2009, 03:20 PM

rubix why'd you do the entire problem for him? how is he supposed to think on his own now?

also yeah you guys all suck rofl

**Kibblre** · 10-22-2009, 03:21 PM

Quote:

Originally Posted by stargroup

well first you have to expand the factorial terms

(x + 2)(x + 1)(x)(x - 1)(x - 2)...
------------------------------- = 9(x + 2)
(x)(x - 1)(x - 2)...

I think you can take it from here

Wow, how did I not think of that?

Thanks a bunch man.

EDIT: Saw Rubix's post after replying, I got the right answer.

MrRubix · 10-22-2009, 03:21 PM

I'm showing him the easiest way to do it -- there's no need to expand **** when you can just cancel **** out

EDIT: OR OK KIBBLE YOU CAN TAKE THE HARD ROUTE OUT THAT'S COOL TOO

**Adamaja456** · 10-22-2009, 03:23 PM

yea just cancel **** out.

glad i could help

stargroup · 10-22-2009, 03:23 PM

well in order to cancel out you have to first understand WHY you can cancel them that way

so while you showed him a solution, I taught him a concept

wrecked

**Kibblre** · 10-22-2009, 03:24 PM

Quote:

Originally Posted by stargroup

well in order to cancel out you have to first understand WHY you can cancel them that way

so while you showed him a solution, I taught him a concept

wrecked

He's basically right, after I saw what he did, I canceled out. I just wasn't sure how (x + 2)! expanded, really.

EDIT: Even though this thread is finished, I bet it will derail.

10-22-2009, 03:15 PM	#1
Kibblre Caelondia Represent Join Date: Jul 2004 Location: A place of hearts and ghosts Age: 31 Posts: 1,984	Help Me With Math? I really don't know how to approach this problem, can somebody help me out? Solve for x: (x + 2)! -------- = 9(x + 2) x! __________________ Какой идиот придумал Бутерброд с дикобраза? Он хулиган и бездельник.

10-22-2009, 03:16 PM	#2
Vanilla Mnm cavs Join Date: Dec 2007 Location: Saratoga, New York Posts: 3,258	Re: Help Me With Math? (x + 2)! -------- = 9x + 18 x!

10-22-2009, 03:16 PM	#3
Zipsnine FFR Veteran Join Date: Aug 2009 Location: Bushkill, P.A. Posts: 150	Re: Help Me With Math? Ok you wrote that weird. Is that supposed to be (x+2)/x=9(x+2)?

10-22-2009, 03:17 PM	#4
stargroup FFR Player Join Date: Jun 2007 Posts: 974	Re: Help Me With Math? well first you have to expand the factorial terms (x + 2)(x + 1)(x)(x - 1)(x - 2)... ------------------------------- = 9(x + 2) (x)(x - 1)(x - 2)... I think you can take it from here __________________ (´･ω･`)

10-22-2009, 03:19 PM	#5
MrRubix FFR Player Join Date: Dec 1969 Location: New York City, New York Posts: 8,340	Re: Help Me With Math? (x + 2)! -------- = 9(x + 2) x! (x + 2)! -------- = 9 x!(x + 2) (x + 1)! -------- = 9 x! x + 1 = 9 x = 8 __________________ https://www.youtube.com/watch?v=0es0Mip1jWY

10-22-2009, 03:19 PM	#6
MrRubix FFR Player Join Date: Dec 1969 Location: New York City, New York Posts: 8,340	Re: Help Me With Math? PS you all suck at math __________________ https://www.youtube.com/watch?v=0es0Mip1jWY

10-22-2009, 03:20 PM	#7
stargroup FFR Player Join Date: Jun 2007 Posts: 974	Re: Help Me With Math? rubix why'd you do the entire problem for him? how is he supposed to think on his own now? also yeah you guys all suck rofl __________________ (´･ω･`)

10-22-2009, 03:21 PM	#9
MrRubix FFR Player Join Date: Dec 1969 Location: New York City, New York Posts: 8,340	Re: Help Me With Math? I'm showing him the easiest way to do it -- there's no need to expand ** when you can just cancel ** out EDIT: OR OK KIBBLE YOU CAN TAKE THE HARD ROUTE OUT THAT'S COOL TOO __________________ https://www.youtube.com/watch?v=0es0Mip1jWY

10-22-2009, 03:23 PM	#10
Adamaja456 Absurd Join Date: Dec 2006 Location: 31 Billion Club, WA Age: 33 Posts: 6,433	Re: Help Me With Math? yea just cancel ** out. glad i could help __________________ 582 Tier Points(Tier 3) 602 AAAs(517+23+62) People who bought me subscriptions/tokens: DrugstoreCowboy(1 month) ELRayford(3 months) ~GJampa(3 months) Jerry DB(3 months) 4th place in Gamewhore Competition(3 months) Phynx(FGJ album and Dendrite V2) dragon890x(1 year) Slide(1 year**)

10-22-2009, 03:23 PM	#11
stargroup FFR Player Join Date: Jun 2007 Posts: 974	Re: Help Me With Math? well in order to cancel out you have to first understand WHY you can cancel them that way so while you showed him a solution, I taught him a concept wrecked __________________ (´･ω･`)

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