Math Help ASAP

#1

Math Help ASAP

Posted: 6/12/06 at 7:25pm

Please, all you people who are just roaming the boards, use your math skills to help me out!

If you have 2 roots of a quadratic equation as (1+3i) and (1-3i) how do you write the quadratic equation in the normal ax^2 +bx+c form?
please and thank you!

Also, I know there is some FOILing involved, could you be ever so kind as to type out those steps? My brian isnt' working and I can't remember this for my final tomorrow!

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And the other thing about the Phantom Lady was, Bert, she realized, in the city that never sleeps... What did she realize, Kitten? That all the songs she'd listened to, all the love songs, that they were only songs. What's wrong with that? Nothing, if you don't believe in them. But she did, you see. She believed in enchanted evenings, and she believed that a small cloud passed overhead and cried down on a flower bed, and she even believed there was breakfast to be had... Where? On Pluto. The mysterious, icy wastes of Pluto.

#2

re: Math Help ASAP

Posted: 6/12/06 at 7:42pm

...Please? I'll love you forever and I'll share my 100 thanks to the answering of this question from my final with you ;D!

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And the other thing about the Phantom Lady was, Bert, she realized, in the city that never sleeps... What did she realize, Kitten? That all the songs she'd listened to, all the love songs, that they were only songs. What's wrong with that? Nothing, if you don't believe in them. But she did, you see. She believed in enchanted evenings, and she believed that a small cloud passed overhead and cried down on a flower bed, and she even believed there was breakfast to be had... Where? On Pluto. The mysterious, icy wastes of Pluto.

#3

re: Math Help ASAP

Posted: 6/12/06 at 7:48pm

I'm sorry, I wish I could help. Even if I could help you, you wouldn't want my help seeing as how I failed my math final this year.

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<--Sometimes it's easier to get out of a jam than into one

#4

re: Math Help ASAP

Posted: 6/12/06 at 7:54pm

DO you have the answer in the back of the book? If what I did is correct, I can explain how to get the answer.

#5

re: Math Help ASAP

Posted: 6/12/06 at 7:57pm

(1 + 3i)(1 - 3i)

F: 1*1=1
O: 1*-3i=-3i
I: 1*3i=3i
L: 3i*-3i=-9i^2

= -9i^2 + 1 (the 3i's cancel eachother out as one is pos. and one is neg.)

I don't know. I could be totally wrong. It's been probably 10 years since I've done one of those.

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"You just can't win. Ever. Look at the bright side, at least you are not stuck in First Wives Club: The Musical. That would really suck. " --Sueleen Gay

Updated On: 6/12/06 at 07:57 PM

#6

re: Math Help ASAP

Posted: 6/12/06 at 8:01pm

I just pm-ed you the same thing.
You can simplify further b/c i^2= -1
so it is -9(-1) + 1 =10
Right?

#7

re: Math Help ASAP

Posted: 6/12/06 at 8:03pm

well the answer is x^2 -2x + 10 = O somehow..
I think the second step is supposed to be
(x-(1+3i)) (x-(1-3i)) but I have no clue how to FOIL that thing.

Thanks for your replies though!! Anyone know where to go from there?

---

And the other thing about the Phantom Lady was, Bert, she realized, in the city that never sleeps... What did she realize, Kitten? That all the songs she'd listened to, all the love songs, that they were only songs. What's wrong with that? Nothing, if you don't believe in them. But she did, you see. She believed in enchanted evenings, and she believed that a small cloud passed overhead and cried down on a flower bed, and she even believed there was breakfast to be had... Where? On Pluto. The mysterious, icy wastes of Pluto.

#8

re: Math Help ASAP

Posted: 6/12/06 at 8:04pm

double post

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And the other thing about the Phantom Lady was, Bert, she realized, in the city that never sleeps... What did she realize, Kitten? That all the songs she'd listened to, all the love songs, that they were only songs. What's wrong with that? Nothing, if you don't believe in them. But she did, you see. She believed in enchanted evenings, and she believed that a small cloud passed overhead and cried down on a flower bed, and she even believed there was breakfast to be had... Where? On Pluto. The mysterious, icy wastes of Pluto.

Updated On: 6/12/06 at 08:04 PM

#9

re: Math Help ASAP

Posted: 6/12/06 at 8:06pm

Oh- I understand what the question is now.. let me try again. I didn't read that it was the two roots of the quad eq'n. I'm tired... will reply in a few.

#10

re: Math Help ASAP

Posted: 6/12/06 at 8:06pm

Don't worry about it :)

I've been staring at this question all day. ANY help is appreciated :)

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And the other thing about the Phantom Lady was, Bert, she realized, in the city that never sleeps... What did she realize, Kitten? That all the songs she'd listened to, all the love songs, that they were only songs. What's wrong with that? Nothing, if you don't believe in them. But she did, you see. She believed in enchanted evenings, and she believed that a small cloud passed overhead and cried down on a flower bed, and she even believed there was breakfast to be had... Where? On Pluto. The mysterious, icy wastes of Pluto.

#11

re: Math Help ASAP

Posted: 6/12/06 at 8:12pm

First, distribute the (-):
(x-1-3i)(x-1+3i)
then foil:
x^2-x+3xi-x+1-3i-3ix+3i-9i^2
cancel out 3xi-3xi, -3i+3i
that leaves you with:
x^2-2x-9i^2+1
x^2-2x-9(-1)+1
x^2-2x+10

#12

re: Math Help ASAP

Posted: 6/12/06 at 8:12pm

Oops

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Am I cut out to spend my time this way?

Updated On: 6/12/06 at 08:12 PM

#13

re: Math Help ASAP

Posted: 6/12/06 at 8:12pm

Shameful triple post...

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Am I cut out to spend my time this way?

Updated On: 6/12/06 at 08:12 PM

#14

re: Math Help ASAP

Posted: 6/12/06 at 8:12pm

(1+3i)(1-3i)

1*1=1

1*-3i= -3i

3i*1= 3i

3i*-3i= -9i^2= 9 because i^2= -1


I think at least...

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Am I cut out to spend my time this way?

#15

re: Math Help ASAP

Posted: 6/12/06 at 8:12pm

THANK YOU!!!
!

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And the other thing about the Phantom Lady was, Bert, she realized, in the city that never sleeps... What did she realize, Kitten? That all the songs she'd listened to, all the love songs, that they were only songs. What's wrong with that? Nothing, if you don't believe in them. But she did, you see. She believed in enchanted evenings, and she believed that a small cloud passed overhead and cried down on a flower bed, and she even believed there was breakfast to be had... Where? On Pluto. The mysterious, icy wastes of Pluto.

#16

re: Math Help ASAP

Posted: 6/12/06 at 8:13pm

Wow... I've never double posted like that before...

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Am I cut out to spend my time this way?

#17

re: Math Help ASAP

Posted: 6/12/06 at 8:14pm

Oops. I misread the question. Sorry!

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"You just can't win. Ever. Look at the bright side, at least you are not stuck in First Wives Club: The Musical. That would really suck. " --Sueleen Gay

#18

re: Math Help ASAP

Posted: 6/12/06 at 8:16pm

Good luck tomorrow! Remember, when you see a problem like that, don't get overwhelmed. Just take it one step at a time and you will be fine!

#19

re: Math Help ASAP

Posted: 6/12/06 at 8:21pm

(1+3i)(1-3i)

Oh geez those are nasty...precalculus from last term that I vaguely remember.
(x-(1+3i)) (x-(1-3i))
So basically FOIL:
F: (x)(x) = x^2
O: (x)(-1+3i) = -x+3xi
I: (x)(-1-3i) = -x-3xi
L: (-1-3i)(-1+3i) = ?
***remember to distribute the negative in parts O & I

You basically have to foil the L part of the original FOIL, so it's a foil inside a FOIL.

(-1-3i)(-1+3i)
F: (-1)(-1) = 1
O: (-1)(3i) = -3i
I: (-3i)(-1) = 3i
L: (-3i)(3i) = -9i^2 = (-9)(-1) = 9

So you get: 1-3i+3i+9 which equals 10

So going back to the first part of the FOIL you know know the product of (-1-3i)(-1+3i), which is 10.

F: (x)(x) = x^2
O: (x)(-1+3i) = -x+3xi
I: (x)(-1-3i) = -x-3xi
L: (-1-3i)(-1+3i) = 10

So then you have: x^2-x+3xi-x-3xi+10, combine like terms, the 3xi's cancle, and you have x^2-2x+10!

[edit] b/c some of the formating became

Updated On: 6/12/06 at 08:21 PM

#20

re: Math Help ASAP

Posted: 6/12/06 at 8:29pm

THank you everyone :)

Geez, I'll have to split my grade amongst many-a-smart-people :)hehe

Thanks again :)

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And the other thing about the Phantom Lady was, Bert, she realized, in the city that never sleeps... What did she realize, Kitten? That all the songs she'd listened to, all the love songs, that they were only songs. What's wrong with that? Nothing, if you don't believe in them. But she did, you see. She believed in enchanted evenings, and she believed that a small cloud passed overhead and cried down on a flower bed, and she even believed there was breakfast to be had... Where? On Pluto. The mysterious, icy wastes of Pluto.

#21

re: Math Help ASAP

Posted: 6/12/06 at 8:36pm

Oh god math! Bad flashback!

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"All I ask of you is one thing: please don't be cynical. I hate cynicism -- it's my least favorite quality and it doesn't lead anywhere. Nobody in life gets exactly what they thought they were going to get. But if you work really hard and you're kind, amazing things will happen." Conan O'Brien

#22

re: Math Help ASAP

Posted: 6/12/06 at 8:59pm

I couldn't understand a thing of that!!! I just had my math final today, and let me tell you: Bea isn't the smartest person in the world!!!

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And.....SCENE!

#23

re: Math Help ASAP

Posted: 6/12/06 at 9:33pm

*blinks*

*Stares*

*leaves*

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"How bout a little black dress?"~hannahshule "I have a penis, not a vagina." ~munkustrap178

#24

re: Math Help ASAP

Posted: 6/12/06 at 9:35pm

***Offers cookies to the fellow math-a-phobes***

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"All I ask of you is one thing: please don't be cynical. I hate cynicism -- it's my least favorite quality and it doesn't lead anywhere. Nobody in life gets exactly what they thought they were going to get. But if you work really hard and you're kind, amazing things will happen." Conan O'Brien

#25

re: Math Help ASAP

Posted: 6/12/06 at 9:39pm

Let's take the cookies and go huddle in another room with a good novel. All these numbers are making me nervous.

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And no one grew into anything new, we just became the worst of what we were."