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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: 85,362

Re: x =

Hi;

x  = 10, x = 8, x = -8, x = -10


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

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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: 85,362

Re: x =

Hi;

Latex is out temporarily.


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

Online

#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: 85,362

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.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

Online

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