The Math Thread (4 N3rdS!!!)

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Krypton
83.798 g/6.022x10^23

Registered: Nov 2003
Location: Texas

The Math Thread (4 N3rdS!!!)

I thought i'de do this for the math geeks in here. i love math, and since im doing a friends internet course for him, i thought ide just rip a problem out and see u guys can do it. im up to the level of pre-calculus, not in the big leagues yet, but the average informed person can probably do these.
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i know the answer to this one, but can u find it?

Find all the real RATIONAL zero's in this equation. (In other words, find how many time "x" crosses the "x" axis on a graph.)(or find all the real solutions of "x" that makes the equation = to zero. youll get a PRIZE!!!

x^3 - 4x^2 + x + 6 = 0

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SOLVED : y = 2(+/-)square root of 14

y = y^2 -3y -10

i have no clue how to find y now, even after factoring it.

y = (y-5)(y+2)

original problem is.

(y+2)/y = 1/y-5

WHAT THE IS Y!!!!????

___________________

Last edited by Krypton on Dec-22-2005 at 01:27

Dec-20-2005 01:33 Korea-Democratic Peoples Republic

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sensorium
Supreme tranceaddict

Registered: Jun 2004
Location:

set everything equal to zero.

___________________

Dec-20-2005 01:35 United States

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Krypton
83.798 g/6.022x10^23

Registered: Nov 2003
Location: Texas

quote:
Originally posted by ierxium
set everything equal to zero.

tried that, doesnt work.

y = y^2-3y-10

y-y = (y^2-3y-10)-y

0 = y^2-4y-10

if i use the quadratic equation, i get very ugly numbers that i know arent right. i dont think i can use the zero property anyways.

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Dec-20-2005 01:37 Korea-Democratic Peoples Republic

sensorium
Supreme tranceaddict

Registered: Jun 2004
Location:

Re: Little homework help (Calculus)

quote:
Originally posted by ::TranceVanDyk::
ive been working this one problem, and have worked it all the way to this point.

y = y^2 -3y -10

i have no clue how to find y now, even after factoring it.

y = (y-5)(y+2)

original problem is.

(y+2)/y = 1/y-5

WHAT THE IS Y!!!!????

edit:: ACTUALLY ITS precalculus, not all the way to the big leagues yet

y^2 - 3y - 10 - y = 0
y^2 - 4y - 10 = 0
(y-5)(y+1) = 0

y=5 y=-1

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Dec-20-2005 01:38 United States

stevieboy32808
==============

Registered: Mar 2005
Location: United States

Re: Re: Little homework help (Calculus)

quote:
Originally posted by ierxium
y^2 - 3y - 10 - y = 0
y^2 - 4y - 10 = 0
(y-5)(y+1) = 0

y=5 y=-1

That's incorrect. If you use F.O.I.L. to check your answer you will get y^2 - 4y - 5.

Trance van Dyk just start from here:
y^2 - 4y - 10 = 0
and use the quadratic formula because that is impossible to factor using regular methods.

Dec-20-2005 01:40

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Krypton
83.798 g/6.022x10^23

Registered: Nov 2003
Location: Texas

Re: Re: Little homework help (Calculus)

quote:
Originally posted by ierxium
y^2 - 3y - 10 - y = 0
y^2 - 4y - 10 = 0
(y-5)(y+1) = 0

y=5 y=-1

lol, nope, u factored it wrong.

what u factored equals y^2-4y-5. c = 10, no 5. this is damn hard.

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Dec-20-2005 01:42 Korea-Democratic Peoples Republic

Ted Promo
NWO WOLFPACK INSANE

Registered: Jun 2005
Location: Can this be my goal??!

set everything equal to davedresden

Dec-20-2005 01:42

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sensorium
Supreme tranceaddict

Registered: Jun 2004
Location:

Re: Re: Re: Little homework help (Calculus)

quote:
Originally posted by stevieboy32808
That's incorrect. If you use F.O.I.L. to check your answer you will get y^2 - 4y - 5.

hence the

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Dec-20-2005 01:43 United States

UWM
mandroid

Registered: Mar 2001
Location: Here

wait this is in a calc class? wtf?

Dec-20-2005 01:43

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AnotherWay83
The B00b Maintenance Guy™

Registered: Aug 2000
Location: land of d(-_-)b

yep, stevieboy is right do what he says

Dec-20-2005 01:44

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Krypton
83.798 g/6.022x10^23

Registered: Nov 2003
Location: Texas

Re: Re: Re: Little homework help (Calculus)

quote:
Originally posted by stevieboy32808
That's incorrect. If you use F.O.I.L. to check your answer you will get y^2 - 4y - 5.

Trance van Dyk just start from here:
y^2 - 4y - 10 = 0
and use the quadratic formula because that is impossible to factor using regular methods.

i guess my answer's going to be y = 2 (+-)square root of 14

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Dec-20-2005 01:45 Korea-Democratic Peoples Republic