# Re: Seven Step Series

```m.a. wrote:
> Hi Bruno,
>                   Yes, this is all clear to me. But when I try to put it
> into practice, confusion reigns. (See bottom of page.) By the way,
> because I'm printing out your lessons and often need to refer back to
> specific ones, it becomes confusing when you append lessons to posts
> with different subjects.  Thanks,    marty a.
>
>
>
>     ----- Original Message -----
>     *From:* Bruno Marchal <mailto:marc...@ulb.ac.be>
...
>     Just a question to proceed later: do you agree that
>
>     (a*a*a*a)/ (a*a*a) = (a*a*a*a) times 1/(a*a*a)
>
>     with this and what I said, you can guess that:
>
>     a^n * a^(-m) = a^(n-m)
>
>     Again, verify this on simple example of your own.
>
>     *OK:  If a=10   and n=3 and   m=4  Following the formula above
>     "a^n * a^(-m)"   ,I get as the first half of the equation:*
>     **
>     *10^3 * 10/4 =  1000 x 2.5=  2500   but for the second half
>     "a^(n-m)    I get:*
>     **
>     *10^(n-m)=  10^ -1=  10/1*
>     **
>     *which of course makes no sense at all.     Where did I go wrong?*```
```
10^(-4) is not equal to 10/4,  it's equal to 1/(10^4) or 0.0001

Brent

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