Math Is Fun Forum

  Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

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#9751 Re: Help Me ! » sgn(x)!!! » 2011-11-12 11:16:14

ok thanks for the help,and could sure use luck!I'm not sure about that brilliantly!

#9755 Re: Dark Discussions at Cafe Infinity » favorite subject » 2011-11-12 08:38:34

first ten fav subjects:
1.Math
2.Math
3.Math
4.Computer Science
5.Math
6.Math
7.Math
8.Math
9.Math
10.Math

#9756 Re: Maths Is Fun - Suggestions and Comments » Parallel and Perpendicular Lines and Planes » 2011-11-12 07:51:30

well this is fine for grades up to 8 but i think a more precise definition would be necessary,because that's how the higher grades learn it.maybe besides what you have you should have a page that explains lines better,if there isn't one already and just give a link to it.i see here that there's one that explains ines on the lower grade level but not the one that gives the real definition of lines by using Euclid's axioms.

EDIT: what i like very much is that you mention that how we draw the line is just our illustration,which is not mentioned that often in other places!

#9757 Re: Help Me ! » sgn(x)!!! » 2011-11-12 07:45:55

hi bob

yes,i have been occupied by school and my subjects.this was a crazy week.i'm glad it's over,but there is next week exams and i have physics, analysis and in the one after i have geometry and programming. very busy weeks! smile

anyway,if i gave the restriction x<>0 then would my answers be correct?

#9758 Re: Help Me ! » doubt on irrational » 2011-11-12 07:39:49

try cubing both sides of both identities and you will see they tell you the same thing.

#9759 Help Me ! » sgn(x)!!! » 2011-11-11 11:42:00

anonimnystefy
Replies: 8

hi guys

i was wondering what derivatives of |x| and sgn(x) are.i thought of something but i got that they were sgn(x) and 0 respectfully.i think something is wrong here.What?

#9760 Re: Maths Is Fun - Suggestions and Comments » Parallel and Perpendicular Lines and Planes » 2011-11-11 11:28:42

hi MIF

nice explanation,definitely easier to understand!

I just have to ask which grade is this meant for?

#9761 Re: Maths Is Fun - Suggestions and Comments » Intelligent Questions » 2011-11-08 11:18:50

hi guys

for bob's sequence question,the first two answers are correct,and the third can also be the answer if the sequence's general term is:

#9762 Re: Help Me ! » quadratic equation » 2011-11-06 02:24:14

i have to complain because f(x) was nowhere defined,so you should fix that.say f(x)=ax^2+bx+c.

#9765 Re: This is Cool » [Crazy Math Picture] Man Giving Three Middle Fingers » 2011-11-04 22:57:35

nope,i followed your advice not to take his advice,and plus,i was listening to my own advice.

#9766 Re: This is Cool » [Crazy Math Picture] Man Giving Three Middle Fingers » 2011-11-04 22:31:55

hi bob

it's just a way of looking at it.one of my professors told us last year,that everybody sees the colour blue differently.i think he's right.

hi bobbym

yes,i remember you saying to never listen to that guy,not just once but at least five times.you are contradictory.i do not like that. shame

#9767 Re: This is Cool » [Crazy Math Picture] Man Giving Three Middle Fingers » 2011-11-04 11:35:22

hi Maiya

the 'her' is a 'him'.

hi bobbym

if that's the one about 90 something then i believe you.i shall believe everything you say about your age.

#9768 Re: This is Cool » [Crazy Math Picture] Man Giving Three Middle Fingers » 2011-11-03 10:07:50

i don't want to learn to subtract,i want to know how old you were then! please!

#9769 Re: This is Cool » [Crazy Math Picture] Man Giving Three Middle Fingers » 2011-11-03 10:02:34

yes but i wont know,because i cannot subtract.tell me how old you were then.

#9770 Re: This is Cool » [Crazy Math Picture] Man Giving Three Middle Fingers » 2011-11-03 09:58:22

but tell me your age then.i won't be able to subtract so i won't discover your age now.

#9771 Re: This is Cool » [Crazy Math Picture] Man Giving Three Middle Fingers » 2011-11-03 09:52:32

maybe the author is a genius,maybe not,but i cannot subtract.

#9775 Re: Jokes » Jokes » 2011-11-02 04:49:29

the probability of the number being right/wrong.

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