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#801 2011-01-14 10:39:44
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Equations with parenthesis?
Please repost the earlier problem and I will show you how.
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#802 2011-01-14 10:44:25
- misheeru
- Member
- Registered: 2010-02-18
- Posts: 4,594
Re: Equations with parenthesis?
Okay thank you
Here you go: (a + b - c)(a + b + c)
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#803 2011-01-14 10:46:46
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Equations with parenthesis?
If I say that x = a + b, then wherever I see an a + b, I can put an x. This is called substitution. So try that now and post your answer.
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#804 2011-01-14 10:49:50
- misheeru
- Member
- Registered: 2010-02-18
- Posts: 4,594
Re: Equations with parenthesis?
Alright, so we turn it into (x - c)(x + c), right?
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#805 2011-01-14 10:54:07
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Equations with parenthesis?
Yes that is correct. Good. You can now use foil on that problem. That is beauty of algebra, how subtle manipulations can turn a tough problem into one we already know how to do. The mathematicians dream! Please do it and post your answer.
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#806 2011-01-14 10:56:51
- misheeru
- Member
- Registered: 2010-02-18
- Posts: 4,594
Re: Equations with parenthesis?
Oh, okay...
(x - c)(x + c)
*F* x²
*O* xc
*I* -cx
*L* -c²
How does that look so far?
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#807 2011-01-14 11:00:28
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Equations with parenthesis?
Very good, except remember the convention with outer.
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#808 2011-01-14 11:02:17
- misheeru
- Member
- Registered: 2010-02-18
- Posts: 4,594
Re: Equations with parenthesis?
Convention?
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#809 2011-01-14 11:07:35
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Equations with parenthesis?
Yes, an agreed way of doing things. Sort of like first name then last name.
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#810 2011-01-14 11:41:30
- misheeru
- Member
- Registered: 2010-02-18
- Posts: 4,594
Re: Equations with parenthesis?
Sorry... had chores
And yes, I know what convention means, I was just wondering if you would point out what I did wrong.
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#811 2011-01-14 11:43:26
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Equations with parenthesis?
*O* xc
What do you think? Does that look good to you?
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#812 2011-01-14 11:45:00
- misheeru
- Member
- Registered: 2010-02-18
- Posts: 4,594
Re: Equations with parenthesis?
Well I thought so... I mean its x c? How else would I write it?
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#813 2011-01-14 11:46:53
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Equations with parenthesis?
Do you remember convention? Hi Schwarzennegger Arnold. Would he like that?
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#814 2011-01-14 11:53:32
- misheeru
- Member
- Registered: 2010-02-18
- Posts: 4,594
Re: Equations with parenthesis?
Oh, you want them switched? I wow.. feel feel stupid now lol
does cx look better?
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#815 2011-01-14 11:54:17
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Equations with parenthesis?
It sure does now how about that problem.
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#816 2011-01-14 12:02:40
- misheeru
- Member
- Registered: 2010-02-18
- Posts: 4,594
Re: Equations with parenthesis?
Alright then, we'd have
x² + cx - cx - c²
Do I simplify or should I switch it back to "a + b" now?
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#817 2011-01-14 12:04:48
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Equations with parenthesis?
Which do you think is easier?
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#818 2011-01-14 12:05:31
- misheeru
- Member
- Registered: 2010-02-18
- Posts: 4,594
Re: Equations with parenthesis?
I think it'd be easier to switch it back at the end. What about you?
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#819 2011-01-14 12:08:30
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Equations with parenthesis?
You are doing the problem, it is your decision. Just please show your next step.
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#820 2011-01-14 12:12:08
- misheeru
- Member
- Registered: 2010-02-18
- Posts: 4,594
Re: Equations with parenthesis?
I will switch it at the end.
x² + cx - cx - c²
= x² - cx² - c²
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#821 2011-01-14 12:13:51
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Equations with parenthesis?
That is a good idea, and I would like to say that is darn close.
How did you come up with -cx^2 when you subtracted cx from cx?
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#822 2011-01-14 12:19:37
- misheeru
- Member
- Registered: 2010-02-18
- Posts: 4,594
Re: Equations with parenthesis?
Oops, i multiplied by mistake.
It should say: x² - c² right?
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#823 2011-01-14 12:20:52
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Equations with parenthesis?
Kayrect! Now you are learning but you are not done yet.
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#824 2011-01-14 12:24:46
- misheeru
- Member
- Registered: 2010-02-18
- Posts: 4,594
Re: Equations with parenthesis?
Yes, I switch now, right?
Do I just turn all the x's into a + b's?
So is it a^2 + b^2 - c^?
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#825 2011-01-14 12:27:46
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Equations with parenthesis?
That is an honest error but not correct. Wherever you see an x you put an a + b. Since x^2 is really x * x you substitute like this
x * x = ( a + b ) ( a + b )
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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