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Negative square roots are not irrational, they are imaginary. Irrational numbers are those that cannot be represented as a fraction.Quote:
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)
a fraction of integers one would hope - else sqrt(2) = sqrt(2)/1 would make sqrt(2) rational ;)
go i love being pedantic :P :)
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.
:blink:
its actually 42 :)Quote:
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.
:blink:
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
Negative square roots are not irrational, they are imaginary. Irrational numbers are those that cannot be represented as a fraction. [/b][/quote]Quote:
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 @ 7 February 2004 - 21:17)</td></tr><tr><td id='QUOTE'> <!--QuoteBegin-cpt_azad@7 February 2004 - 23:11
thanks man! really needed that! i think i get it now (negative square roots being irrational)
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
1/sqrt(1/4) = 2 = real, rational
so "1/sqrt(x) = irrational number... has to be multiplied by its conjugate" isnt true :)
:o . i understand what dwk is saying, but wtf does this mean:Quote:
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 :)
Quote:
1/sqrt(1/4) = 2 = real, rational
so "1/sqrt(x) = irrational number