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**AISSAISHAK****Member**- Registered: 2011-01-02
- Posts: 3

help me solve this function plz

here we have:

we need to solve this:

thx.:)

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**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 7,525

hi AISSAISHAK

By 'solve' do you mean 'simplify'?

Extra brackets not needed

Or did you mean:

Let's try both

(i)

so

or

(ii)

so

Oh! That was a surprise!

Bob

*Last edited by bob bundy (2011-01-13 02:52:30)*

Children are not defined by school ...........The Fonz

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

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**AISSAISHAK****Member**- Registered: 2011-01-02
- Posts: 3

bob bundy, thx for ur quick reply

I meant this

I know the steps, what I dont know is how to compute this

coz this is where I was stuck! so is it equals to 0 (zero)?if not, can you show me the last steps till we get only "2" at the end by canceling or subtracting .. -->

annd can you tell me where can i find how to deal with exponents and natural log by learnin some rules/law about them

really big help if u show me the way!

cheers

*Last edited by AISSAISHAK (2011-01-13 03:47:33)*

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,947

Hi AISSAISHAK;

coz this is where I was stuck! e^x+e^-x so is it equals to 0

Whatever you do, do not that!

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **A number by itself is useful, but it is far more useful to know how accurate or certain that number is.**

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**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 7,525

hi AISSAISHAK

but

because when you add the indices you get zero and anything to the power zero is 1.

As for

the top factorises to

and then the top and bottom brackets cancel out.

As for learning the rules why not start with

http://www.mathsisfun.com/algebra/exponents-logarithms.html

The main 'Maths Is Fun' pages are full of explanations and exercises.

Try the page and post again if you are still unsure about anything.

Bob

*Last edited by bob bundy (2011-01-13 11:41:16)*

Children are not defined by school ...........The Fonz

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

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**AISSAISHAK****Member**- Registered: 2011-01-02
- Posts: 3

hey thx bob , that was very helpful ..

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**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 7,525

You're welcome,

Bob

Children are not defined by school ...........The Fonz

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

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