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» Northern California Ford Owners     » Automotive   » General Talk   » Math help before 830 A.M. 04/14/2011

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Author Topic: Math help before 830 A.M. 04/14/2011
KINGROY
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Having a massive brain fart right now. can someone find the inverse of f(x)=x+4/x-3 then solve for y? I'm stuck at solving for y. the answer is f-1(x)=3x+4/x-1. but how do you get there? much appreciated. any answer after about 8:30 PST wont do me any good because I'll be taking an exam at that time. LOL.

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Posts: 1642 | From: Vallejo, CA | Registered: Jun 2007  |  :
NEIGHT
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I just did the problem in my head let me try to figure out how to put this down [Mad]
showing work has always been the hardest shit for me idk why I can do nearly every problem in my head but not show work teachers always thought I would copy [Mad]

[ April 14, 2011, 03:52 AM: Message edited by: NEIGHT ]

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Posts: 18529 | From: EA$T $IDE REDWOOD CITY | Registered: Nov 2008  |  :
SHOalex
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quote:
Originally posted by NEIGHT:
I just did the problem in my head let me try to figure out how to put this down [Mad]
showing work has always been the hardest shit for me idk why I can do nearly every problem in my head but not show work teachers always thought I would copy [Mad]
Cool story bro.

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Posts: 1448 | From: Oakland | Registered: Jun 2007  |  :
KINGROY
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quote:
Originally posted by SHOalex:
quote:
Originally posted by NEIGHT:
I just did the problem in my head let me try to figure out how to put this down [Mad]
showing work has always been the hardest shit for me idk why I can do nearly every problem in my head but not show work teachers always thought I would copy [Mad]
Cool story bro.
I need answers not stories. LOL

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Posts: 1642 | From: Vallejo, CA | Registered: Jun 2007  |  :
03smknsvt
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hope this helps


http://www.analyzemath.com/inversefunction/Tutorials.html

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Posts: 1535 | From: san jose | Registered: Mar 2005  |  :
03smknsvt
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Given f(x)=3x+4
1. Is f(x) a function? Why or why not?
Yes, it is a function because for each value of "x"
there is only one value of "y"---the y will be 3 times
the x value plus 4.
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2. Is f -1(x) a function? Why or why not?
Yes it is. The inverse function can be found as follows:

y=3x+4
Interchange x and y to get:
x=3y+4
Solve for y to get:
y=(1/3)x-(4/3)
This is a function for the same reasons given
in part #1.

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03 silver cobra #3461 out of 8394
96 gt supercharged
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93 cobra
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"A journey of a thousand miles begins with a single step"
Posts: 1535 | From: san jose | Registered: Mar 2005  |  :
KINGROY
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quote:
Originally posted by 03smknsvt:
Given f(x)=3x+4
1. Is f(x) a function? Why or why not?
Yes, it is a function because for each value of "x"
there is only one value of "y"---the y will be 3 times
the x value plus 4.
--------------
2. Is f -1(x) a function? Why or why not?
Yes it is. The inverse function can be found as follows:

y=3x+4
Interchange x and y to get:
x=3y+4
Solve for y to get:
y=(1/3)x-(4/3)
This is a function for the same reasons given
in part #1.
thanks bro

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2003 Cobra Vert
2005 Prius
Posts: 1642 | From: Vallejo, CA | Registered: Jun 2007  |  :
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Posts: 9308 | Registered: Oct 2004  |  :
fredfifty
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all i know is that E=mc2

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Sydewayz_Stan
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Damn the equation in the original post gave me flashbacks of 10th grade

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Posts: 3432 | From: 707 vallejo/richmond 510 | Registered: Aug 2010  |  :
Sydewayz_Stan
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quote:
Originally posted by 94droptopGT:
-
LMFAO!

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Posts: 3432 | From: 707 vallejo/richmond 510 | Registered: Aug 2010  |  :
KINGROY
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quote:
Originally posted by sydewayzLX50:
quote:
Originally posted by 94droptopGT:
-
LMFAO!
Fuck you, LOL

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2003 Cobra Vert
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Posts: 1642 | From: Vallejo, CA | Registered: Jun 2007  |  :
hidnn.o.s.
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quote:
Originally posted by sydewayzLX50:
quote:
Originally posted by 94droptopGT:
-
LMFAO!
[patriot]

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R.I.P. Willie G. You are missed on this forum
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