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another maths question
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Elfy Offline
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Post: #1
another maths question

[Image: image.jpg]

It's a rearrange equation? Hidden quadratic?

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10-20-2011 04:08 AM
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Aya Offline
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Post: #2
RE: another maths question

Yes it is. I'm working on it right now.
10-20-2011 04:43 AM
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Elfy Offline
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Post: #3
RE: another maths question

I'm thinking:

sqrt(t) = 4 + 12/sqrt(t

rearrange

t-4sqrt(t) - 12 = 0

(sqrt(t) - 6)(sqrt(t) + 2) = 0

6 or -2

t = 36

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(This post was last modified: 10-20-2011 04:59 AM by Elfy.)
10-20-2011 04:57 AM
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Prince Rilian Offline
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Post: #4
RE: another maths question

Why did you eliminate 4? I can't see the image in the first post.

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10-21-2011 10:17 AM
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sergeant Offline
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Post: #5
RE: another maths question

FUCKING fail no picture at the beginning
10-21-2011 11:39 AM
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Elfy Offline
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Post: #6
RE: another maths question

wut?

original is:

solve

sqrt(t) = 4 + 12/sqrt(t)

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10-21-2011 02:15 PM
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Prince Rilian Offline
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Post: #7
RE: another maths question

So why did you eliminate 4? Something about principle roots?

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10-21-2011 02:52 PM
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Efs Offline
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Post: #8
RE: another maths question

I'm alright at Math, but what's the question I don't understand...

(01-10-2012 02:15 PM)Maelstrom Wrote:  Efs, your nihilism is beautiful.
10-23-2011 06:28 AM
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sergeant Offline
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Post: #9
RE: another maths question

sqrt(t) = 4 + 12/sqrt(t)

Multiply both sides by sqrt(t)

t = 4sqrt(t) + 12

Subtract 12 from both sides (you're isolating the root)

t - 12 = 4sqrt(t)

Square both sides

t^2 - 24t +144 = 16t

Subtract 16t from both sides

t^2 - 40t + 144 = 0

Now you have a quadratic equation. HIDDEN QUADRATIC

36, 4

If you input 4 you will realize it is the opposite of the root and it won't work. Square roots refer only the the positive number which when squared equals the original. Oh well.

36 = t
(This post was last modified: 10-23-2011 07:00 AM by sergeant.)
10-23-2011 06:59 AM
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