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#1 2013-02-10 05:01:58

cooljackiec
Member
Registered: 2012-12-13
Posts: 160

x =

Find all real values of  x that satisfy the equation (x^2-82)^2 = 324

Last edited by bobbym (2013-02-10 06:04:17)


I see you have graph paper.
You must be plotting something
lol

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#2 2013-02-10 05:55:53

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 81,420

Re: x =

Hi;

x  = 10, x = 8, x = -8, x = -10


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

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#3 2013-02-10 07:59:25

cooljackiec
Member
Registered: 2012-12-13
Posts: 160

Re: x =

help me on another one

\frac{c}{c-5}=\frac{4}{c-4}

FInd c.

Also, the LaTeX doesn't seem to work..


I see you have graph paper.
You must be plotting something
lol

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#4 2013-02-10 08:02:06

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 81,420

Re: x =

Hi;

Latex is out temporarily.


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

#5 2013-02-10 17:49:24

Sabbir
Guest

Re: x =

If you cross multiply,then you'd get c^2-4c=4c-20 which is c^2-8c+20=0,now you just have to find the polynomial's roots.

#6 2013-02-10 23:20:14

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 81,420

Re: x =

Hi;

I am getting

c = 4 - 2 i and c = 4 + 2 i


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

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