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#10401 Re: Help Me ! » Solving Quadratics by Factoring and Graphing » 2011-07-25 02:34:42

hi zee-f

the first one is correct,but the second one isn't finished.

you didn't solve x^2-4=0.

#10406 Re: Puzzles and Games » Band around the Earth » 2011-07-25 00:32:19

hi bob

yes you are right.you could express it in km but it wouldn't change anything cuz the stuf in kilometres cancels out.

#10407 Re: Exercises » Is this cool with you? » 2011-07-25 00:04:36

but if the (10,10,10,10,10) is the same when the first two tens are flipped than shouldn't (14,6,30) be the sam as the triple with the first two flipped which is (6,14,30)

#10408 Re: Puzzles and Games » Band around the Earth » 2011-07-25 00:01:55

hi djohnstone3

welcome to the forum.

you are probably right but it would be nice if you could post the problem here.

#10409 Re: Exercises » Is this cool with you? » 2011-07-24 23:55:43

so (10,10,10,10,10) would be diffferent from (10,10,10,10,10) because we can pay 1st 2nd and 3rd 10 to the first guy,or we could pay 1st 3rd and 5th ten to the first guy.that doesn't seem very logical if you write it as an ordered sequence.

#10410 Re: Exercises » Is this cool with you? » 2011-07-24 22:46:34

hi

is (4,16,30) the same as (16,4,30)?

#10411 Re: Exercises » Is this cool with you? » 2011-07-24 22:27:19

hi

so to pay them both out he could do it like this:(90,100)?

#10412 Re: Exercises » Is this cool with you? » 2011-07-24 22:24:25

hi bobbym

see you finally solved it.what does the (20,30) mean?

#10414 Re: Euler Avenue » Two special numbers » 2011-07-24 20:50:46

hi

actualy the value of x^x^x^x^...:
Let s=x^x^x^...
s=x^(x^x^x^...)
s=x^s
So once we can sole this equation in terms of x then we get the value of s.

#10415 Re: Maths Is Fun - Suggestions and Comments » Mutually Exclusive Events » 2011-07-24 09:21:52

hi john

first time i have seen you online as well.are you here often?

#10416 Re: Dark Discussions at Cafe Infinity » """Friends"""" » 2011-07-24 07:13:19

hi bob

yes they are mutually exclusive,but maybe he has something in between that he cannot describe any differently,or there is someone that is sometimes his enemy and sometimes his friend.

#10417 Re: Dark Discussions at Cafe Infinity » """Friends"""" » 2011-07-24 06:06:34

friends+enemies=frenemies.the best definition you will find.

#10418 Re: Exercises » Limits! » 2011-07-24 06:05:14

ure welcome.i didn't understand it at first.

#10419 Re: Help Me ! » Factoring Polynomials » 2011-07-24 01:59:47

i think that if a polynomial can be factored by any other method than it can also be done by grouping.

#10420 Re: This is Cool » A new approach in Calculus » 2011-07-24 01:57:57

hi safp7

welcome to the forum.Why can't you post links?

#10421 Re: Help Me ! » Factoring Polynomials » 2011-07-24 01:56:52

x^2-169=
x^2-13x+13x-169=
x(x-13)+13(x-13)=
(x+13)(x-13)???

#10422 Re: Help Me ! » Factoring Polynomials » 2011-07-24 01:55:12

hi bobbym

could 19 be done by grouping?

#10423 Re: Help Me ! » how do i integrate this? » 2011-07-24 00:33:49

hi nevinsmith

i think it should be u=x and dv=(sinx)^3 dx

#10424 Re: Exercises » Limits! » 2011-07-24 00:32:17

hi

because (x,y) is apraching (0,0) we can come to that point along any line that goes through that point.and because y=x satisfies that condition we can use that line to calculate the limit.

#10425 Re: Exercises » Limits! » 2011-07-24 00:22:12

you can approach the limit from infinitely many sides,but just because two of them match upo doesn't mean that it exists.if you substitute y=x than you get:


my answer of 1/4 isn't equal to your answer of 1 so the limit doesn't exist.

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