#1
So I have an geometry report due tomorrow, and it's about the Golden Ratio. I've worked all day and got most of it done. There's only one part I need to do. I must prove mathematically the exact value of the Golden ratio.
I have this link,
http://library.thinkquest.org/27890/goldenRatio2p.html , but the only thing I don't understand is how to do the cross multiplying and the quadratic formula. I would really like to know how to get the answer to the quadratic step in the link. The steps to get what is said in the third step.

I hate homework help threads to, but I'm desperate. Any help is welcome!!
I usually wouldn't be in this situation and ask you guys, but many of you seem very knowledgeable.
Thanks in advance!
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Last edited by OzarkMDaredevil at Dec 1, 2008,
#2
next time don't wait until the last day. >_>

aside from that bit of advice, i really cant help you.
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#4
a report? like and Essay? how many words/pages? Moar info pls!

Edit: Sorry read your post again, doesn't really help.
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#5
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#8
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Help me to help you, help me to help you, help me to help you.


Dr. Cox? Is that you?

Its strange that I'm in college doing calc almost everyday, but give me old geometry stuff and I have a hell of a time remembering stuff like this.

Good luck, my friend.
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#9
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#10
All I need to do is prove it algebraically, no page number. I just need to do a 'paragraph proof' to prove it. Using **** like hence, therefore...Etc.
What I would ultimately like to know is how to get the whole quadratic formula and cross multiplying from the link in the original post.
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#11
Substitute 1 for X

y*y=y^2
y*-1=-y
1*1=1
therefore 1=y^2-y
subtract 1 from each side, you get the quadratic equation 0=y^2-y-1
use the quadratic formula

Hope that helped

EDIT: wait , do you need to know how to get to cross multyplying?
#12
Quote by DartS17
Substitute 1 for X

y*y=y^2
y*-1=-y
1*1=1
therefore 1=y^2-y
subtract 1 from each side, you get the quadratic equation 0=y^2-y-1
use the quadratic formula

Hope that helped

EDIT: wait , do you need to know how to get to cross multyplying?

I need to know what the Quadratic formula is and how he got from this


To this



Thanks for your help though.
I love Foxy Shazam more than you.



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Last edited by OzarkMDaredevil at Dec 1, 2008,
#13
K just gimme a few minutes, I'll get my old math notes and see if i can help some more

EDIT: Couldn't find ****, but looks like he can help\/\/\/
Last edited by DartS17 at Dec 1, 2008,
#14
the quadratic formula:

-b +/- sqrt. b^2 -4ac
_______________
2a


soooo

a = 1
b = -1
c = -1

so he's got

- -1 +/- sqrt. -1^2 - 4x1x-1
_____________________
2x1

and that is equal to the things that he got, i think you'll find.

edit:

1 + sqrt. (5)
__________
2


and

1 - sqrt. (5)
___________
2


yeah, it works perfectly


hope you get your work done.


edit again:

its difficult to type the quadratic formula. if you were to say it to someone, it would sound like this:

"minus B, plus OR minus the square root of B squared minus four A C divided by two A"


so, the bit where it says +/-, that means that theres two solutions, the positive and negative roots will give them both.
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Last edited by instagata0 at Dec 1, 2008,
#15
You two are absolute life savers. I am eternally grateful to you. I will suck you off or give you money or virgins or something. Thank you very much!!!!!!!!!!!!!!!!!!!!!!!! I got it done! **** YES!!!
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