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(no subject)
Posted:
Sep 14, 2007 11:06 PM
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---------- Forwarded message ----------
From: Tricia Donovan <triciad@crocker.com>
Subject: Re: Exponents: getting the value of x.
Date: Wed, 12 Sep 2007 11:07:37 -0400
To: numeracy@world.std.com
Sender: numeracy-approval@world.std.com
Precedence: list
Reply-To: numeracy
Lynda offers an elegant and easy solution to the problem.
Tricia
On Sep 10, 2007, at 11:05 PM, Lynda Ginsburg wrote:
> Alternatively, starting with 16, you could keep dividing by 2 until the
> quotient is 1, and then count up the number of times you divided by 2
> (or
> the number of times 2 was a factor).
>
> 16/2 = 8
> 8/2 = 4
> 4/2 = 2
> 2/2 = 1
>
> You divided 16 by 2 four times, therefore 2^4 = 16
>
> Lynda
>
> Martha Haehl wrote:
>> Do you mean how would this be solved algebraically? Guess and check
>> would
>> not require a calculator. Try 2^1 then 2^2, 2^3, 2^4.
>>
>> Martha
>>
>>>>> bomber32 <discussions@mathforum.org> 09/03/07 10:25 PM >>>
>> 2^4 = 16
>>
>> now
>>
>> 2^x = 16
>>
>> we all know that x = 4. But how exactly do we get x without using a
>> calculator?
>>
>>
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>
>
> --
> Lynda Ginsburg
> Senior Research Associate, MetroMath
> Rutgers University
> tel: 732-445-1409
>
>
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