BF2S Forums Math Help

VicktorVauhn wrote:

Hurricane2k9 wrote:

VicktorVauhn wrote:

why the fuck would you square both sides when x isn't even under a radical? square root of 3 is just a number like anything else, if this was 5x = x-4 would you square it?
x*sqrt(3)=x-4
x*sqrt(3) -x=-4
x*(sqrt(3)-1)=-4
x=-4/(sqrt(3)-1)
done. Don't need quadratic formula and squaring stuff...Its really basic algebra...

what happened to the other X? it magically turned into a -1?

You guys make my head hurt x(sqrt(3)-1) is x*(sqrt(3)-x, x times -1 = -x
google distributive property.

This is seriously like algebra 1

Your notation didn't help anyone see that.

nukchebi0 wrote:

VicktorVauhn wrote:

Hurricane2k9 wrote:

what happened to the other X? it magically turned into a -1?

You guys make my head hurt x(sqrt(3)-1) is x*(sqrt(3)-x, x times -1 = -x
google distributive property.

This is seriously like algebra 1

Your notation didn't help anyone see that.

Its fairly obvious, and my computer doesn't have a square root key. I explained it in words in my previous post, it basic math, and that is the way square root is typed out if you don't have the use of symbols. I am sorry you are confused by parenthesis, when you see a number on the outside of them and an equation on the inside it means you multiply each term of the equation on the inside by the number on the outside.

mcminty wrote:

VicktorVauhn wrote:

I am sorry you are confused by parenthesis, when you see a number on the outside of them and an equation expression on the inside it means you multiply each term of the equation expression on the inside by the number on the outside.

Fixed

Edit: How did this get on to the distributive law...?

Hurricane asked what happened to the second X when I factored it out, so I told him to look up law of distribution to see how -1 would become x....

contrary to popular belief memorizing the difference between equations and expressions and other random vocab will not help you do math... To many people focus on memorizing rules and laws rather then just understanding what is going on. I have never been big on memorizing more then is necessary.

VicktorVauhn wrote:

Hurricane asked what happened to the second X when I factored it out, so I told him to look up law of distribution to see how -1 would become x....

contrary to popular belief memorizing the difference between equations and expressions and other random vocab will not help you do math... To many people focus on memorizing rules and laws rather then just understanding what is going on. I have never been big on memorizing more then is necessary.

Ah ok,


And so memorising (or just 'knowing', as I know what they are...) Rank, Kernel, Image and Nullity won't help me in my algebra test this afternoon?

mcminty wrote:

Ryan wrote:

x√3 = x-4

How do I get x?

Maybe this notation is a little clearer...

x.√3 - x = -4

x.(√3-1) = -4

x = -4/(√3-1)

If anything it's less clear.

Is "√3-1" "the square root of 3, minus 1" or "the square root of 3-minus-1"?

Scorpion0x17 wrote:

mcminty wrote:

VicktorVauhn wrote:

Hurricane asked what happened to the second X when I factored it out, so I told him to look up law of distribution to see how -1 would become x....

contrary to popular belief memorizing the difference between equations and expressions and other random vocab will not help you do math... To many people focus on memorizing rules and laws rather then just understanding what is going on. I have never been big on memorizing more then is necessary.

Ah ok,


And so memorising (or just 'knowing', as I know what they are...) Rank, Kernel, Image and Nullity won't help me in my algebra test this afternoon?

It may help you pass the test, but will it help you understand the subject?

Bingo, and unless for some reason your teacher feels like specifically quizzing you on their meanings you can do math just fine with out knowing any of those words.

nukchebi0 wrote:

I am sorry you are confused by parenthesis, when you see a number on the outside of them and an equation on the inside it means you multiply each term of the equation on the inside by the number on the outside.

Wow, thanks for the math lesson, professor. I'm struggling through algebra this year, and your brilliance just shines through the cloud that is the complicated concepts. Really, stop being so arrogant. You aren't smarter than anyone else, even if your misguided mind wants it to be so. I know how to do math; don't be so ignorant. It just makes you look pathetic and desperate for attention.

I am definitely smarter then some in here, lol... but that doesn't mean much, your smarter then some in here too... Its not like we are all exactly equal and I am pretty sure I am not at the bottom. Not that I ever mentioned anything about being smarter then others in here.
Honestly though if you understand and already knew what I explained then what I wrote really isn't difficult to read, If you are having trouble with it you made a mistake, or don't understand. If you don't understand I explained, if you made a mistake... hell it happens, but that is your mistake and nothing to do with my statement.

Ryan wrote:

mcminty wrote:

Ryan wrote:

x√3 = x-4

How do I get x?

Maybe this notation is a little clearer...

x.√3 - x = -4

x.(√3-1) = -4

x = -4/(√3-1)

Then rationalize the denominator so you get x = -2√3/1

really, like somebody else said (i think it was victorvaughn), rationalizing the denominator is a waste of a step and just another potential for error. when you get past trig nobody cares anymore.

edit: according to this bad boy, you're in algebra 2. maybe. i estimated myself to a 44.

Last edited by Ender2309 (2008-10-16 22:54:27)

Scorpion0x17 wrote:

"the square root of 3-minus-1"?

also commonly known as √2...

again that's passing a test. The people invented those terms did it all with out having an actual name for it. Math isn't really a vocab type of thing... there is plenty of vocab surrounding it but in the end the words are just representations of concepts... you can memorize all the fancy words you want but you wont be able to really do anything unless you understand the concept itself.

Conversely, you can ignore all the math speak and just learn concepts and still be able to apply them perfectly well. The vocab is only really worth while when your talking about math for math's sake... when it comes time to apply it all and actually get any use out of it the words themselves are pretty meaningless and wont help you with much.

That is what me and Scorpion mean.

and the answer  is -40°c +33" long penis and a mind controlled mouse..... who cares

bad-man wrote:

and the answer  is -40°c +33" long penis and a mind controlled mouse..... who cares

The people that value some kind of coherence.

Scorpion0x17 wrote:

mcminty wrote:

Scorpion0x17 wrote:

"the square root of 3-minus-1"?

also commonly known as √2...

Exactly.

How can you say "exactly" to that??

If I had written √3-1 as meaning the "square root of 3-minus-1", then I would have written √2. So I must have meant "the square root of 3, minus 1".


How is that confusing at all?