Math Problem

[h1]

Originally posted by cpt_azad@7 February 2004 - 23:11
thanks man! really needed that! i think i get it now (negative square roots being irrational)

Negative square roots are not irrational, they are imaginary. Irrational numbers are those that cannot be represented as a fraction.

[vivitron 15]

a fraction of integers one would hope - else sqrt(2) = sqrt(2)/1 would make sqrt(2) rational


go i love being pedantic

[fugley]

I don't know exactly how I know this but I think the answer = 3.

Though it might be wisest to check out my hypoprosfecies via another mechanism / apparatus before committing it to print.

[kAb]

Originally posted by fugley@8 February 2004 - 11:53
I don't know exactly how I know this but I think the answer = 3.

Though it might be wisest to check out my hypoprosfecies via another mechanism / apparatus before committing it to print.

its actually 42

[DWk]

Come on now. The absolute value doesn't "take the negativity" out of a number.

Absolute value is the distance from a number to the origin. That's why |-3| = 3, because the distance from -3 to 0 (the origin in our decimal system) is 3. As well, |3| = 3 because it goes from 3 to 0.

-·--·---·--·--·--|--·--·--·--·---·-
-5 -4 -3 -2 -1 0 1 2 3 4 5

hope that was clear


EDIT - Forgot the answers

- |-2/3| = 2/3
- |-1|+|3| = 1+3 = 4
- |5|-|-2| = 5-2 = 3
- |-3|-|-4| = 3-4 = -1
- |1.2-1.5| = |-0.3| = 0.3
- |4| = 4
- |1/2-3/4| = |2/4 - 3/4| = |-1/4| = 1/4
- |-6| = 6

[DWk]

Originally posted by haxor41789+7 February 2004 - 21:17--></div><table border='0' align='center' width='95%' cellpadding='3' cellspacing='1'><tr><td>QUOTE (haxor41789 &#064; 7 February 2004 - 21:17)</td></tr><tr><td id='QUOTE'> <!--QuoteBegin-cpt_azad@7 February 2004 - 23:11
thanks man&#33; really needed that&#33; i think i get it now (negative square roots being irrational)

Negative square roots are not irrational, they are imaginary. Irrational numbers are those that cannot be represented as a fraction. [/b][/quote]
Yeps:

sqrt(-1) = 1i = imaginary number
1/sqrt(x) = irrational number... has to be multiplied by its conjugate

By the way, regarding Abs. value... go here

[vivitron 15]

1/sqrt(1/4) = 2 = real, rational

so "1/sqrt(x) = irrational number... has to be multiplied by its conjugate" isnt true

[cpt_azad]

Originally posted by vivitron 15@8 February 2004 - 15:30
1/sqrt(1/4) = 2 = real, rational

so "1/sqrt(x) = irrational number... has to be multiplied by its conjugate" isnt true

. i understand what dwk is saying, but wtf does this mean:

1/sqrt(1/4) = 2 = real, rational

so "1/sqrt(x) = irrational number