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#2 Re: Help Me ! » Simplify the following: » Today 02:31:02

You should use the substitution idea.

#4 Re: Help Me ! » Simplify the following: » Today 02:04:55

Whatever works for you is good.

#5 Re: Help Me ! » Simplify the following: » Today 01:52:43

I never knew you were just behind your machine

I do not understand.

Try the second one and post if you get stuck.

#7 Re: Help Me ! » Simplify the following: » Today 01:13:57

Hi;

Can you work the second one?

#10 Re: Help Me ! » ratio and proportion » Yesterday 04:15:45

Hi ydnac;

I am getting 10.5 hours just like back then.

#13 Re: Help Me ! » Simplify the following: » 2014-08-30 21:21:01

Hi;

The book is right in both cases.

#16 Re: Help Me ! » Simplify the following: » 2014-08-30 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.

#18 Re: Help Me ! » Simplify the following: » 2014-08-30 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.

#19 Re: Help Me ! » Simplify the following: » 2014-08-30 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.

#20 Re: Help Me ! » Simplify the following: » 2014-08-30 03:37:00

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

#21 Re: Help Me ! » Simplify the following: » 2014-08-30 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

#23 Re: Help Me ! » Simplify the following: » 2014-08-30 03:14:57

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

#25 Re: Help Me ! » Permuation Problems » 2014-08-30 01:31:49

Hi;

EM:

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

Analytically:

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