Plz help! Math question.

cracked · 04-09-2002, 08:51 PM

i have a math test tomorrow. of course i have studied non whatsoever so im gonna do bad on it but i got a question.

in my book it has problems like the following:

||v||=something blah blah where v is like a vector or something

i know that |x| means absolute value of the variable but what does ||x|| with two bars on each side mean? thanks a lot, i needed the help...

ps. anyone know of a good math homework help (alg. III, trig, precalculus) website that is free? i could really use one as my teacher is the stereotypical teacher from hell (he isnt mean but he should be fired for lack of teaching skills). my book isnt much help at all either. thanks!

Cr/-\c|<e|)

NeoStarO1 · 04-09-2002, 09:30 PM

the book does not show an example with the ||x||??? Its been a while since I done math but im inclined to guess its similar to |-x|

So not totally sure. So don't quote me on that.

NeoStar

Edit: Im not finding much, im looking around math.com that is the only place i know of that is half way decent.

NeoStar

kakyoin · 04-09-2002, 09:37 PM

Quote:

Originally posted by cracked
i have a math test tomorrow. of course i have studied non whatsoever so im gonna do bad on it but i got a question.

in my book it has problems like the following:

||v||=something blah blah where v is like a vector or something

i know that |x| means absolute value of the variable but what does ||x|| with two bars on each side mean? thanks a lot, i needed the help...

If I'm not mistaken......(It's been awhile)

it means the length of the vector

kakyoin
(using the new found knowledge of quoting

)

kakyoin · 04-09-2002, 10:01 PM

I just re-verified it, it is the length of the vector
An advanced way of saying that:
||x|| = sqrt (x.x) [square root of x dot x]

quoted from a dusty linear algebra book

04-09-2002, 10:07 PM

Quote:

i have a math test tomorrow. of course i have studied non whatsoever so im gonna do bad on it but i got a question.

Perhaps you should study more then?

cracked · 04-09-2002, 10:12 PM

yeah i should study more, but i cant help it, i just cannot will myself to do it, although i am studing as we type. thanks for helping guys, keep em commin!!

Cr/-\c|<e|)

04-09-2002, 10:35 PM

I like your honesty.

geekgrl · 04-10-2002, 08:21 AM

What class you taking? Perhaps when you need help, you can PM me. I'm ok at math.... (a bit obsessed with it)

TonTo · 04-10-2002, 10:37 AM

wow.... crackhead math.... that's like the square root of pie... aint no one every gonna need it, aint no one ever needed it,

cracked · 04-10-2002, 08:16 PM

geekgrl, the class is entitled Advanced Math, its part of the North Carolina curriculum. its like algebra 3, trig, and precalc all in one. ill be sure to pm you if i need help. thanks a lot!!!!!!!