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**bronxsystem****Member**- Registered: 2013-06-22
- Posts: 63

Hey all

I can do most of these but cant get past this one for some reason.

=

but i get stuck here S: is this totally wrong?

with the other problems i was able to factor them then cancel out. But this one i keep getting to this point and get confused

*Last edited by bronxsystem (2014-01-21 04:21:39)*

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 87,231

Hi;

There are probably a couple of ways to get there:

1) Multiply top and bottom by a.

1) Multiply top and bottom by a2.

**In mathematics, you don't understand things. You just get used to them.Of course that result can be rigorously obtained, but who cares?Combinatorics is Algebra and Algebra is Combinatorics.**

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**bronxsystem****Member**- Registered: 2013-06-22
- Posts: 63

from the last one? 1+a/a * a2/1-a2

multiply both by a?

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 87,231

Hi;

No, I was starting from the beginning.

Now you multiply top and bottom of that by a2.

**In mathematics, you don't understand things. You just get used to them.Of course that result can be rigorously obtained, but who cares?Combinatorics is Algebra and Algebra is Combinatorics.**

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**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,426

hi

Is that a2 really

?

Bob

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 87,231

Hi Bob;

Hmmm, that is probably true.

Latexify, latexify, latexify. Our lives are frittered away by ascii, latexify!

**In mathematics, you don't understand things. You just get used to them.Of course that result can be rigorously obtained, but who cares?Combinatorics is Algebra and Algebra is Combinatorics.**

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**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,426

Years of teaching pupils with squiggly writing. I'm used to powers appearing in random places.

Bob

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

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**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,426

By the way. Who were you quoting with that latexify quote?

Bob

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 87,231

I was trying to quote Henry David Thorough. Got it backwards it seems.

HDT wrote:

Our life is frittered away by detail. Simplify, simplify, simplify! I say, let your affairs be as two or three, and not a hundred or a thousand; instead of a million count half a dozen, and keep your accounts on your thumb-nail.

Of course that result can be rigorously obtained, but who cares?

Combinatorics is Algebra and Algebra is Combinatorics.

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**bronxsystem****Member**- Registered: 2013-06-22
- Posts: 63

in the book it doesnt have the exponent it just says a2 but maybe its typo? omg >< i will retry

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**bronxsystem****Member**- Registered: 2013-06-22
- Posts: 63

im sure its a typo because the 2 is after the a which does not conform with previous exercises.

i spent 2 hours on this :*( 2 hours 20 minutes

thanks all for help and very sorry for wasting everyones time.

*Last edited by bronxsystem (2014-01-21 05:20:23)*

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 87,231

If you follow Post #4 will get you there very easily.

But you will then notice that the book problem must be a typo. But if it is not then the answer is

Of course that result can be rigorously obtained, but who cares?

Combinatorics is Algebra and Algebra is Combinatorics.

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**bronxsystem****Member**- Registered: 2013-06-22
- Posts: 63

the answer in book was in line with the typo

but thank you (: i will save this thread and review the problem assuming it was a2 and try work it out using your working (:

thanks thanks thanks

*Last edited by bronxsystem (2014-01-21 05:40:24)*

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 87,231

Hi;

Yes, that is more likely to be the problem. Review what has posted up above to get that answer.

Of course that result can be rigorously obtained, but who cares?

Combinatorics is Algebra and Algebra is Combinatorics.

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