i am retarded

[rock rash]

i can not figure this ot for the life of me...maybe its case im rnning off 2 hrs of sleep...please help :D

what is the inverse of f(x)=x/(x-3)

[MogifiedXJ]

Just take the first derivative of the function

[rock rash]

that doesnt give the inverse

[5-90]

f(x) = y, therefore y = x/(x-3).

Solve for x.

5-90

[rock rash]

i know, i keep getting stuuck at y(x-3)=x or y=x(x-3)^-1

[MogifiedXJ]

f(x)^-1 = 3(-x+1)

[rock rash]

nope, or maybe there is something wrong with the data base

[OT]

The answer is 4.

[MogifiedXJ]

that doesnt give the inverse
I don't know why I told you to do that...That's what I get for not reading.

[5-90]

The answer is 4.

No - 42. Didn't you read Hitchhiker's Guide to the Galaxy? It was a trilogy of five books with a short story prequel...

[OT]

No - 42. Didn't you read Hitchhiker's Guide to the Galaxy? It was a trilogy of five books with a short story prequel...
How many roads must a man walk down?

[5-90]

How many roads must a man walk down?

"What do you get when you multiply six by nine?"

[Sniggs]

"What do you get when you multiply six by nine?"
In China 69 is pronounced, "Tu-Can-Chu".

[shelbyluvv]

I must be retarded, I have no idea what is going on here?

[Ramsey]

Idiots. The answer is C.

[riverfever]

What if 6 turned out to BE 9?

[rock rash]

thanks for the help guys! :D

[5-90]

2 + 2 = 5, for extremely large values of two...

[Ramsey]

2 + 2 = 5, for extremely large values of two...
I hate people that say that, nothing personal.

[olivedrabcj7]

f(x)^-1 = 3(-x+1)
so (y)^-1 = -3x+3 ??

[5-90]

I hate people that say that, nothing personal.

Pray, why?

Remind me not to show you my middle school algebra notes when I find them - I wrote a "flawed proof" (there was only one small flaw, which took me a while to bury...) that 1 = 2, and that the entire numbering system was, therefore, BS. Took my teacher about a month and a half to find the flaw...

5-90

[Ramsey]

I like logic and things that make sense, just because you can prove it on paper doesnt make it true. Math is just a bunch of made up mumbo jumbo anyways:D

[XJ Dreamin']

http://img113.imageshack.us/img113/2702/xoverxminus3sj0.jpg (http://imageshack.us)

for x from x=1 to x=30 :)

[XJ Dreamin']

http://img108.imageshack.us/img108/8029/negativexgo4.jpg (http://imageshack.us)

the other side of zero :confused1

[rock rash]

all i need is the equation for the inverse!!!

[thebrick]

if y = x/(x-3)

solve for x

y(x-3)=x

(x-3)/x = 1/y

1-3/x = 1/y

-3/x = 1/y -1

3/x = 1 - 1/y

3/x = y/y - 1/y

3/x = (y-1)/y

x/3 = y/(y-1)

x = 3y/(y-1)

Of course, I could be wrong...

[thebrick]

actually, if f(x) = x/(x-3)...if you are looking for 1/f(x)...would it be as simple as 1/x/(x-3) ---> (x-3)/x???

[thebrick]

if you plug in some numbers...

f(2) = 2/(1-3) = -1
f(4) = 4/(4-3) = 4
f(10) = 10/(10-3) = 10/7

then

f(2)^-1 = (1-3)/2 = -1
f(4)^-1 = (4-3)/4 = 1/4
f(10)^-1 = (10-3)/10 = 7/10

[dzolcali]

I hate people that say that, nothing personal.

in the business world we always say 2+2=5...because thats how you make money, minimal inputs and maximal outputs...mathmatically it's stupid though but it's a little buzz word type thing thats used.

[XJ_Vikings]

this thread has shown me i really need to review my precalc to avoid failing this semester...

[rock rash]

if y = x/(x-3)

solve for x

y(x-3)=x

(x-3)/x = 1/y

1-3/x = 1/y

-3/x = 1/y -1

3/x = 1 - 1/y

3/x = y/y - 1/y

3/x = (y-1)/y

x/3 = y/(y-1)

x = 3y/(y-1)

Of course, I could be wrong...

[rock rash]

thats what i was forgetting...oh and its correct

[Ramsey]

How the hell could you forget that?

[thebrick]

"01000111 01101111 01100100 00100000 01000100 01100001 01101101 01101110 01100101 01100100 00100000 01001110 01100101 01110111 01100010 01110011 00100001"

"God Damned Newbs!"

???

[nitrogt101]

y = x/(x-3)
i usually switch x and y then solve for y
x = y/(y-3)
x(y-3) = y
xy-3x-y = 0
xy-y-3x = 0
y(x-1)-3x = 0
y(x-1) = 3x
y = 3x/(x-1)

That is the inverse. Hope that helped, if you have any questions about a step let me know and i'll say what i did.

[Lawn Cher']

this thread has shown me i really need to review my precalc to avoid failing this semester...

And then when you graduate you'll never use any of it again.

[Ramsey]

Just like your dick when you got married :D

[rock rash]

How the hell could you forget that?
you read the title of the thread!?!

[rock rash]

"01000111 01101111 01100100 00100000 01000100 01100001 01101101 01101110 01100101 01100100 00100000 01001110 01100101 01110111 01100010 01110011 00100001"

"God Damned Newbs!"

???

yeah...point is? :D

[Ramsey]

you read the title of the thread!?!

yeah, like i can read

[Lawn Cher']

Just like your dick when you got married :D

Actually, my wife is a borderline nympho.

[gregmondro]

this is why I hate math.

[Lawn Cher']

this is why I hate math.

We aren't talking about math anymore. This is off-topic, try to keep up.

[IcedXJ]

We aren't talking about math anymore. This is off-topic, try to keep up.
hahaha

[GermanXJ]

No NO your all wrong.
Its like this:geek: F=t9 (456H+A 91234%)T.

[Ramsey]

Actually, my wife is a borderline nympho.
I'm sorry. I predict death by snoo snoo in your future.