Gesh
Planet
Mishap Molly Cordell
Posts: 453 
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Post by Gesh on Jun 6, 2010 11:11:38 GMT -5
Hold on, I do have one question... How would you use this method if the two numbers on either end don't add up to equal the number in the middle? For example...
3x² + 16x + 5
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Post by metallica210 on Jun 6, 2010 11:20:03 GMT -5
3*5=15.
15+1=16, and 15*1=15
i hope it makes sense... im not a good teacher. i didn't say that the two equaled each other, refrence my explanation.
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Gesh
Planet
Mishap Molly Cordell
Posts: 453
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Post by Gesh on Jun 6, 2010 11:24:15 GMT -5
So what do you do with that 15? I'm sorry, I'm having trouble fitting it in with your original explanation.
EDIT: Ohh!!! I think I get it... okay, I'll start testing this out, see if I really have a handle on it...
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Post by metallica210 on Jun 6, 2010 11:27:23 GMT -5
do you know how to simplify something like: x²+ Bx+C?
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Gesh
Planet
Mishap Molly Cordell
Posts: 453
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Post by Gesh on Jun 6, 2010 11:31:50 GMT -5
I get it, I get, I get it, thank you a ton, your method is so much easier than that guess and check stuff.  |
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Post by metallica210 on Jun 6, 2010 11:35:03 GMT -5
cool.happy to help.
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Deleted
Deleted Member
Posts: 0
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Post by Deleted on Jun 6, 2010 11:51:09 GMT -5
Yeah, it would come out to (3x+15)(3x+1)
Then you'd get (x+5)(x+1/3)
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Post by metallica210 on Jun 6, 2010 11:53:20 GMT -5
^ no. you only simplify one.
so it would be (x+5)(3x+1)
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Gesh
Planet
Mishap Molly Cordell
Posts: 453
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Post by Gesh on Jun 6, 2010 11:54:05 GMT -5
Why don't they teach this method in schools? That's what I'd like to know... How did your brother learn about it?
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Post by metallica210 on Jun 6, 2010 12:12:47 GMT -5
a teacher at my brother's high school recently found this out. i guess they haven't had time to teach it to everyone yet.
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Gesh
Planet
Mishap Molly Cordell
Posts: 453
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Post by Gesh on Jun 6, 2010 13:19:27 GMT -5
Well thanks a bunch for sharing it. Plus now I have the bragging rights. >  I learned about it before almost everybody else. Mwahahaha... |
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Post by metallica210 on Jun 6, 2010 16:58:22 GMT -5
<BRAG> i learned it before you! <BRAG>
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Gesh
Planet
Mishap Molly Cordell
Posts: 453
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Post by Gesh on Jun 6, 2010 18:40:28 GMT -5
XD
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Post by metallica210 on Jun 6, 2010 18:49:22 GMT -5
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Post by cooltiger413 on Jun 6, 2010 19:47:18 GMT -5
do you know how to simplify something like: x²+ Bx+C? This is what I had learned up to. Although thanks for teaching me that, I'm probably going to end up learning it next year. |
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Post by metallica210 on Jun 6, 2010 19:49:46 GMT -5
yeah.
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TheIslander
Planet
From a Land Surrounded by Sea.
Posts: 403
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Post by TheIslander on Jun 7, 2010 10:24:08 GMT -5
Just wanted to point out that all the trinomials you have mentioned Ax^2 + Bx + C must be = 0 before starting to solve them. You may lose a mark if you forget to make it =0.
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Post by metallica210 on Jun 7, 2010 14:28:24 GMT -5
not if your factoring it. solving it is different.
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TheIslander
Planet
From a Land Surrounded by Sea.
Posts: 403
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Post by TheIslander on Jun 7, 2010 17:24:38 GMT -5
I've got a question myself:
After working out a question I get:
Sinhx = 1/4
But it wants the answer in the form ln p.
My math is a bit rusty, I cannot find a <simple> way of doing this. Anyone care to explain a simple way of doing this? I'm quite sure that there is a way to do this with a sci calculator which I have forgotten.
I know that ep = x.
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Post by mynameisnotimporta on Jun 11, 2010 22:23:08 GMT -5
The "Accelerated" Class. I'm in 7th grade, I'm learning 7th and 8th grade math all in one year (this year). Then I get to learn 9th grade math in 8th grade, 10th grade math in 9th grade, ect., until eventually I get to earn collage credits in highschool, which means I don't have to take as many classes in collage. Anyway thanks for all the great websites guys, I'm sure they'll all help. Do you live in NY? Because i had all of the samestuff in Pre Algebra last year, and this year I take algebra. I use www.regentsprep.org but it may only have the 9th grade math |
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