The OFFICIAL Homework Help Topic (UPDATE. READ.) - VGF

Sen. Brak Obama (FACE) · 02-13-2005, 03:20 PM

You ever think about creating a Homework Help Topic? For people who are stuck with specific problems and that may need help on how to do them when their teacher is a crazy pscho who doesn't teach very well?

[I change title. Woo. -Andi]
[I Win again. Woo. -Andre] [img]tongue.gif[/img]
[NOT SO HIGH AND MIGHTY NOW, ARE YOU MR. MAN?!!]

[ February 24, 2005, 04:44 PM: Message edited by: Bad Andi ]

ocarinagirl · 02-13-2005, 03:48 PM

...That's a pretty good idea, actually. [img]smile.gif[/img]

This topic could suffice for that for a bit, then if we get more people needing help in different subjects, I'll just make seperate topics concerning those subjects.

Sounds like someone needs help...?

Sen. Brak Obama (FACE) · 02-13-2005, 05:04 PM

Nah, I'm fine, I just thought it was a good idea.

But I want you to try this sample problem.

Find the other roots of this equation

x^3+2x^2+6x+3; 2i

Solve Andi

ocarinagirl · 02-13-2005, 06:34 PM

ACK! YOU KNOW MY ONLY WEAKNESS! NOOOOO...

Errr...

x(x^2+2x+9)

x(x+ )(x+ )

...Umm...

...

...I'll appoint someone else to be the math guru person.

Curly Brace · 02-13-2005, 07:00 PM

Anyone read the death of Julius Caesar? I need help on my guided reading question.

ocarinagirl · 02-13-2005, 07:44 PM

As in the Shakespearean play?

No, but I'm actually going to be reading it pretty soon, believe it or not. [img]tongue.gif[/img]

Beam Yosho the Drunkard · 02-13-2005, 08:24 PM

I have......but probably already forgetten most of it.

Might be able to help ya.

Katyrna · 02-13-2005, 08:34 PM

^Sorry, haven't read that one yet.

I saw the math question and I had to try!

The other roots are -2i and -0.579507... I cheated on the second one by using my calculator, but trust me, I've been trying to figure out how to get that last one without it for 20 minutes. Using Descartes' Rule of Signs and synthetic division can only get you so far... =P Yay for ICA class! (Seriously, is there a way to get that fraction without a calculator?? Now I want to know!)

Curly Brace · 02-13-2005, 08:52 PM

I need to know why in the middle of the battle that Brutus and Cassius were fighting about. I'm up to the part where Brutus's wife dies, if that can help you a bit.

Sen. Brak Obama (FACE) · 02-13-2005, 09:07 PM

Quote:

Originally posted by Katyrna:
^Sorry, haven't read that one yet.

I saw the math question and I had to try!

The other roots are -2i and -0.579507... I cheated on the second one by using my calculator, but trust me, I've been trying to figure out how to get that last one without it for 20 minutes. Using Descartes' Rule of Signs and synthetic division can only get you so far... =P Yay for ICA class! (Seriously, is there a way to get that fraction without a calculator?? Now I want to know!)

Use a graphing calculator
Plug the equation in "Y=" then hit 2nd Graph, and it'll give you a table, any X where Y = 0 is a root.
And leave it at an irrational root

But I don't have my calc so I can't do this one.

Katyrna · 02-13-2005, 09:30 PM

^ But, does that work when the answer's imaginary? Also, I was taught another way, where you can graph the equation and then look for where it intersects the x-axis. Then just go to 2nd, Trace, and then 2: zero, if you're using a TI-83 or other related model. Move the cursor to the left of where the intersection is and hit enter, and then right of the intersection and hit enter again. Put it one more time somewhere in between the two and hit enter once more--that'll show you the correct x-value.

Hint: For anybody else out there working with imaginary numbers, if you're given one of the imaginaries, the opposite of it will also be a solution. They always come in pairs as a rule. So since 2i was given, you automatically assume -2i is true, too. Wow, I finally understand enough math to answer something... O.O

Sen. Brak Obama (FACE) · 02-13-2005, 09:51 PM

And, the other root is either -1 or -3

Sen. Brak Obama (FACE) · 02-13-2005, 09:56 PM

When you do the PNI chart you get two possible solutions:
P N I
0 3 0
0 1 2

Since 2i Is a root, and there can never be just ONE imaginary root, but like Kat said, -2i is your other root.

Multiplying (X-2i)(X+2i) gets you X^2+4

But usually you'll get planned problems which will come out with sensible roots, and by sensible I mean solvable because 95% of math past Algebra I is unneeded crap.

The Missing Link · 02-14-2005, 12:37 AM

Quote:

Originally posted by Down With The King:
x^3+2x^2+6x+3; 2i

2i isn't a root of this equation.

x^3+2x^2+6x+3; 2i

(2i)³ = 2³i³ = 8(-1)i = -8i
2(2i)² = 2(2²)i² = 8(-1) = -8
6(2i) = 12i
3

-8i - 8 + 12i + 3 = -5 + 4i != 0.

"There are some who call me... Link?"

"Carpe Gaium Domesticum!" (Seize the Cucco!)
Zelda: The Grand Adventures | Triforce MUCK
ザ行方不明リンク
悪いユウモアの賢人

Swordmaster Link · 02-14-2005, 12:41 AM

This topic would be great for me and my physics homework.

***CaptHayfever*** · 02-14-2005, 02:07 AM

Quote:

Find the other roots of this equation
x^3+2x^2+6x+3; 2i

Um, I see no equation here.

And remember, "I'm-a Luigi, number one!"

The Missing Link · 02-14-2005, 08:55 AM

^ If you presume it set equal to zero, it is.

"There are some who call me... Link?"

"Carpe Gaium Domesticum!" (Seize the Cucco!)
Zelda: The Grand Adventures | Triforce MUCK
ザ行方不明リンク
悪いユウモアの賢人

***CaptHayfever*** · 02-14-2005, 02:10 PM

Well, I could presume it was set equal to -3 or to a google and it would be an equation. If anything should be presumed, it would be to set it equal to some y [i.e. f(x)].

Pardon my pickiness, but sloppy math questions bug me. I don't mind sloppy work, but the question should at least be clear.

Oh, and Andre, it's more like 95% of math past Geometry, not just Alg 1. [img]smile.gif[/img]

And remember, "I'm-a Luigi, number one!"

Sen. Brak Obama (FACE) · 02-14-2005, 04:40 PM

I SAID ANDI SOLVE.

Not you guys, I just threw in together two types of things we've been doing in Algebra, it was not meant to be this much discussed.

ocarinagirl · 02-14-2005, 05:04 PM

^Too bad. I can't solve it, so I'm leaving it up to them.

And they will battle to the death until I say otherwise.

02-13-2005, 03:20 PM	#1
Sen. Brak Obama (FACE) Polk/McLaughlin '08: The Greatness You Already Knew Join Date: Feb 2004 Location: Birmingham, AL Gender: Posts: 12,905 Thanks: 909 Thanked 646 Times in 378 Posts Points: 46,086.18 Bank: 444,820.10 Total Points: 490,906.28 Donate	You ever think about creating a Homework Help Topic? For people who are stuck with specific problems and that may need help on how to do them when their teacher is a crazy pscho who doesn't teach very well? [I change title. Woo. -Andi] [I Win again. Woo. -Andre] [img]tongue.gif[/img] [NOT SO HIGH AND MIGHTY NOW, ARE YOU MR. MAN?!!] [ February 24, 2005, 04:44 PM: Message edited by: Bad Andi ] __________________

02-13-2005, 05:04 PM	#3
Sen. Brak Obama (FACE) Polk/McLaughlin '08: The Greatness You Already Knew Join Date: Feb 2004 Location: Birmingham, AL Gender: Posts: 12,905 Thanks: 909 Thanked 646 Times in 378 Posts Points: 46,086.18 Bank: 444,820.10 Total Points: 490,906.28 Donate	Nah, I'm fine, I just thought it was a good idea. But I want you to try this sample problem. Find the other roots of this equation x^3+2x^2+6x+3; 2i Solve Andi __________________

02-13-2005, 07:00 PM	#5
Curly Brace THE ALL AROUND YUMMIEST. Join Date: Oct 2003 Location: Maryland Gender: Posts: 5,774 Thanks: 127 Thanked 116 Times in 82 Posts Points: 14,414.93 Bank: 37,251.94 Total Points: 51,666.88 Donate	Anyone read the death of Julius Caesar? I need help on my guided reading question. __________________ WHAT HAS SCIENCE DONE?!

02-13-2005, 08:52 PM	#9
Curly Brace THE ALL AROUND YUMMIEST. Join Date: Oct 2003 Location: Maryland Gender: Posts: 5,774 Thanks: 127 Thanked 116 Times in 82 Posts Points: 14,414.93 Bank: 37,251.94 Total Points: 51,666.88 Donate	I need to know why in the middle of the battle that Brutus and Cassius were fighting about. I'm up to the part where Brutus's wife dies, if that can help you a bit. __________________ WHAT HAS SCIENCE DONE?!

02-13-2005, 09:51 PM	#12
Sen. Brak Obama (FACE) Polk/McLaughlin '08: The Greatness You Already Knew Join Date: Feb 2004 Location: Birmingham, AL Gender: Posts: 12,905 Thanks: 909 Thanked 646 Times in 378 Posts Points: 46,086.18 Bank: 444,820.10 Total Points: 490,906.28 Donate	And, the other root is either -1 or -3 __________________

02-13-2005, 03:48 PM	#2
ocarinagirl Senior Member Join Date: Jan 2001 Location: Ehhh? What? Where am I?! Gender: Posts: 3,010 Thanks: 0 Thanked 0 Times in 0 Posts Points: 7,701.83 Bank: 500.00 Total Points: 8,201.83 Donate	...That's a pretty good idea, actually. [img]smile.gif[/img] This topic could suffice for that for a bit, then if we get more people needing help in different subjects, I'll just make seperate topics concerning those subjects. Sounds like someone needs help...?

02-13-2005, 06:34 PM	#4
ocarinagirl Senior Member Join Date: Jan 2001 Location: Ehhh? What? Where am I?! Gender: Posts: 3,010 Thanks: 0 Thanked 0 Times in 0 Posts Points: 7,701.83 Bank: 500.00 Total Points: 8,201.83 Donate	ACK! YOU KNOW MY ONLY WEAKNESS! NOOOOO... Errr... x(x^2+2x+9) x(x+ )(x+ ) ...Umm... ... ...I'll appoint someone else to be the math guru person.

02-13-2005, 07:44 PM	#6
ocarinagirl Senior Member Join Date: Jan 2001 Location: Ehhh? What? Where am I?! Gender: Posts: 3,010 Thanks: 0 Thanked 0 Times in 0 Posts Points: 7,701.83 Bank: 500.00 Total Points: 8,201.83 Donate	As in the Shakespearean play? No, but I'm actually going to be reading it pretty soon, believe it or not. [img]tongue.gif[/img]

02-13-2005, 08:24 PM	#7
Beam Yosho the Drunkard Senior Member Join Date: Apr 2003 Location: The oversized rock of Hawaii. Gender: Posts: 5,665 Thanks: 5 Thanked 17 Times in 13 Posts Points: 22,045.39 Bank: 500.00 Total Points: 22,545.39 Donate	I have......but probably already forgetten most of it. Might be able to help ya.

02-13-2005, 08:34 PM	#8
Katyrna Junior Member Join Date: Apr 2004 Location: Hiding in the band locker from the man with an air bazooka... Gender: Posts: 243 Thanks: 6 Thanked 4 Times in 4 Posts Points: 3,506.39 Bank: 592.15 Total Points: 4,098.54 Donate	^Sorry, haven't read that one yet. I saw the math question and I had to try! The other roots are -2i and -0.579507... I cheated on the second one by using my calculator, but trust me, I've been trying to figure out how to get that last one without it for 20 minutes. Using Descartes' Rule of Signs and synthetic division can only get you so far... =P Yay for ICA class! (Seriously, is there a way to get that fraction without a calculator?? Now I want to know!)

02-13-2005, 09:30 PM	#11
Katyrna Junior Member Join Date: Apr 2004 Location: Hiding in the band locker from the man with an air bazooka... Gender: Posts: 243 Thanks: 6 Thanked 4 Times in 4 Posts Points: 3,506.39 Bank: 592.15 Total Points: 4,098.54 Donate	^ But, does that work when the answer's imaginary? Also, I was taught another way, where you can graph the equation and then look for where it intersects the x-axis. Then just go to 2nd, Trace, and then 2: zero, if you're using a TI-83 or other related model. Move the cursor to the left of where the intersection is and hit enter, and then right of the intersection and hit enter again. Put it one more time somewhere in between the two and hit enter once more--that'll show you the correct x-value. Hint: For anybody else out there working with imaginary numbers, if you're given one of the imaginaries, the opposite of it will also be a solution. They always come in pairs as a rule. So since 2i was given, you automatically assume -2i is true, too. Wow, I finally understand enough math to answer something... O.O

02-13-2005, 09:56 PM	#13
Sen. Brak Obama (FACE) Polk/McLaughlin '08: The Greatness You Already Knew Join Date: Feb 2004 Location: Birmingham, AL Gender: Posts: 12,905 Thanks: 909 Thanked 646 Times in 378 Posts Points: 46,086.18 Bank: 444,820.10 Total Points: 490,906.28 Donate	When you do the PNI chart you get two possible solutions: P N I 0 3 0 0 1 2 Since 2i Is a root, and there can never be just ONE imaginary root, but like Kat said, -2i is your other root. Multiplying (X-2i)(X+2i) gets you X^2+4 But usually you'll get planned problems which will come out with sensible roots, and by sensible I mean solvable because 95% of math past Algebra I is unneeded crap. __________________

02-14-2005, 12:41 AM	#15
Swordmaster Link Super Bodyguard & King of the Arcade Join Date: Apr 2000 Location: Wherever you want me to be Gender: Posts: 29,494 Thanks: 211 Thanked 504 Times in 347 Posts Points: 528.85 Bank: 1,071,207.40 Total Points: 1,071,736.25 Donate	This topic would be great for me and my physics homework.

02-14-2005, 08:55 AM	#17
The Missing Link Professional Lurker Join Date: Dec 2000 Location: New Hyrule, Washington, US Gender: Posts: 15,573 Thanks: 80 Thanked 183 Times in 110 Posts Points: 5,556.15 Bank: 51,115.11 Total Points: 56,671.26 Donate	^ If you presume it set equal to zero, it is. "There are some who call me... Link?" "Carpe Gaium Domesticum!" (Seize the Cucco!) Zelda: The Grand Adventures \| Triforce MUCK ザ行方不明リンク悪いユウモアの賢人

02-14-2005, 02:10 PM	#18
*CaptHayfever* Smash Supermod Join Date: Jul 2002 Location: (n) - the place where I am Gender: Posts: 19,083 Thanks: 146 Thanked 695 Times in 448 Posts Points: 101,938.38 Bank: 788.45 Total Points: 102,726.83 Donate	Well, I could presume it was set equal to -3 or to a google and it would be an equation. If anything should be presumed, it would be to set it equal to some y [i.e. f(x)]. Pardon my pickiness, but sloppy math questions bug me. I don't mind sloppy work, but the question should at least be clear. Oh, and Andre, it's more like 95% of math past Geometry, not just Alg 1. [img]smile.gif[/img] And remember, "I'm-a Luigi, number one!"

02-14-2005, 04:40 PM	#19
Sen. Brak Obama (FACE) Polk/McLaughlin '08: The Greatness You Already Knew Join Date: Feb 2004 Location: Birmingham, AL Gender: Posts: 12,905 Thanks: 909 Thanked 646 Times in 378 Posts Points: 46,086.18 Bank: 444,820.10 Total Points: 490,906.28 Donate	I SAID ANDI SOLVE. Not you guys, I just threw in together two types of things we've been doing in Algebra, it was not meant to be this much discussed. __________________

02-14-2005, 05:04 PM	#20
ocarinagirl Senior Member Join Date: Jan 2001 Location: Ehhh? What? Where am I?! Gender: Posts: 3,010 Thanks: 0 Thanked 0 Times in 0 Posts Points: 7,701.83 Bank: 500.00 Total Points: 8,201.83 Donate	^Too bad. I can't solve it, so I'm leaving it up to them. And they will battle to the death until I say otherwise.