Re: Can TI-85 calcs FOIL?
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At 11:09 PM 11/23/96 -0400, you wrote:
><Andy Johnson <prjohnson@sisna.com> had this to say>
>
>> Caitlin Keidel wrote:
>> >
>> > >from this: x^2+25
>> > >to this?: (x+5)(x-5)
>> >
>> > Not to be a pest or anything but x^2+25 does not factor into (x+5)(x-5).
>> >
>> > The correct equation is: x^2-25
>> >
>> > --Caitlin
>>
>> Or the correct factors are (x+5i)(x-5i).
>>
>
>Where did the 'i',s come from?
>
>
>
>Assume a vitue if you have it not.
>
>/\/\/\/\/\/\
>Wild Bill
>/\/\/\/\/\/\
>
>
The i's are there because the factors of x^2+25 are complex. i = sqrt -1
i allows you to work with complex #'s.
Rukh
O
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