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

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#2 Re: Help Me ! » Simplify the following: » Today 04:17:38

Normally you would say what number when multiplied by itself equals 9

Well 3 x 3 = 9 and  (-3) x (-3) = 9 so why is it not

The reason is the √ operator or instruction means only the positive one so the first one is correct. There is more but it is jargon that you do not need right now.

#4 Re: Help Me ! » Simplify the following: » Today 04:04:35

That is the same thing but it is bit less clear. Although you understand it remember that math is language. Soon your mind will begin to utilize the rules of this language and you will speak it better and better. But because it is a language you must speak it to other people. Not only must you understand it they must understand it when you speak it to them.

#5 Re: Help Me ! » Simplify the following: » Today 03:52:16

Since when we are solving an equation like this we are always trying to get an x all by itself on one side.

We know that 2 x (1/2) = 1 so if we square both sides

we are done.

#6 Re: Help Me ! » Simplify the following: » Today 03:37:00

I would agree, but remember the square root has a precise meaning. It only takes the positive answer.

#7 Re: Help Me ! » Simplify the following: » Today 03:26:56

Please, is the following the same?

x^2 and x^1/2

No , they are not the same. x^2 says x * x while x^(1/2) =√x

For numbers it will be easier to see:

4^2 = 4 x 4 = 16

4^(1/2) = √4 = 2

#9 Re: Help Me ! » Simplify the following: » Today 03:14:57

Do you see why you raise both sides up to the 3 / 2 power?

#11 Re: Help Me ! » Permuation Problems » Today 01:31:49



s1 = Permutations[{m, a, t, h, e, m, a, t, i, c, s}, {11}];
Cases[s1, {___, a, ___, e, ___, a, ___, i, ___}] // Length


#13 Re: This is Cool » Look at this! » Today 00:56:36

Then why were you trying to find the author?

Agnishom wrote:

I was kidding.

#15 Re: This is Cool » Look at this! » Today 00:22:06

I already know that.

#17 Re: This is Cool » Look at this! » Yesterday 23:44:36

A bogus quote it is? Hmmm, ferret out the author we must.

#18 Re: This is Cool » Look at this! » Yesterday 23:36:38

But his quote has no meaning to me by his own words. When he joins the forum I will listen to him.

#19 Re: This is Cool » Look at this! » Yesterday 23:24:01

bobbym wrote:

Then get to know more people.

Perhaps in the past, one could lead a sheltered existence and only know of 50 -100 people. But this is the 21st century, the time of Armageddon. I personally know close to 40 million people thanks to the internet and so should you.

And by the way, Rafiqul Amin, I do not know him...

#20 Re: This is Cool » Look at this! » Yesterday 23:16:20

When did I say or act that it was personal? I feel wonderful, so I post wonderfully. I thought my reply would brighten up Olinguito's day.

But by the way in answer to your bogus statement.

Everything is personal - Michael Corleone

#21 Re: This is Cool » Look at this! » Yesterday 22:55:11


I never said that. Please read post #1.

As I have said many times I am not a math guy, I am a computational guy. Thusly, I stay away from dry math definitions of the type best left to the theoreticians whom are experts in such things.

But since this is the kind of post JFF would deliver at me my heart has experienced a warm feeling. For that I thank you.

#22 Re: Help Me ! » Simplify the following: » Yesterday 22:51:17

When we raise an expression to a power we multiply the powers.

So to get x^(2/3) = x we multiply it by its inverse (2/3)(3/2) = 1

#24 Re: This is Cool » Look at this! » Yesterday 20:08:48


You will always have to violate one condition on this problem because I believe that it is impossible.

Hath ye seen the Sulemann challenge?

#25 Re: Help Me ! » Simplify the following: » Yesterday 20:06:50

Because I latexed it up incorrectly!

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