# Anyone want to help me with my Calculus homework? it would be greatly appreciated :)

Discussion in 'Community Discussion' started by christall109, May 4, 2008.

1. ### christall109 macrumors 6502

Joined:
Jun 15, 2007
#1
Hey Guys so here's the problem:

Solve for n.

x^4 = x^(2n) times (-2x)^(n-11)

Any advice would be greatly appreciated. I know there has to be math geniuses out there!

2. ### dukebound85 macrumors P6

Joined:
Jul 17, 2005
Location:
5045 feet above sea level
3. ### christall109 thread starter macrumors 6502

Joined:
Jun 15, 2007
#3
how? I was thinking doing it that way.

4. ### dukebound85 macrumors P6

Joined:
Jul 17, 2005
Location:
5045 feet above sea level
#4
well try it then instead of think it

i could show you but that would pretty much mean i did the problem right? not purpose of assignment lol

5. ### christall109 thread starter macrumors 6502

Joined:
Jun 15, 2007
#5
well I tried with the logs but got a invalid domain..

so what i did was just set 4=2n + n - 11 and got n=5

Is that correct?
Thanks for the help!

6. ### KompleX macrumors regular

Joined:
Mar 4, 2008
Location:
Downey, CA
#6
did you mean this????
x^(4) = x^[(2n)*(-2x)^(n-11)]

7. ### iJohnHenry macrumors P6

Joined:
Mar 22, 2008
Location:
On tenterhooks
#7
Anyone want to help me with my Calculus homework? it would be greatly appreciated

Only if you wish to fail.

This puts me in mind of a scene from the movie The Day The Earth Stood Still.

8. ### dukebound85 macrumors P6

Joined:
Jul 17, 2005
Location:
5045 feet above sea level
#8
you arent doing something right and without seeing steps its hard to comment

9. ### siurpeeman macrumors 603

Joined:
Dec 2, 2006
Location:
the OC
#9
i kind of read it as x^4 = [x^(2n)]*[(-2x)^(n-11)].

the lazy person in me wants to move all the x's on one side and everything else to the other. and i do know that n = 6.5 is a solution for x = -2. i don't have any paper, so i can't think to make n as a function of x.

because of the -2, you can't do this.

10. ### Veldek macrumors 68000

Joined:
Mar 29, 2003
Location:
Germany
#10
Transform the equation into

x^4 = (x^2)^n * (-2x)^n * (-2x)^(-11)

Then collect the ^n terms on one side, so that you only have one ^n term, and the rest on the other side. Then you can log it up.

Joined:
Sep 13, 2007
Location:
Here
12. ### NightFlight macrumors 6502

Joined:
Feb 25, 2007
Location:
Northern Virginia
#12