<![CDATA[Math Is Fun Forum / factor theoroms]]> 2019-11-07T03:33:35Z FluxBB https://www.mathisfunforum.com/viewtopic.php?id=1440 <![CDATA[Re: factor theoroms]]> MathsIsFun wrote:

If you can do something in maths, then someone is bound to say "can you go backwards?"

What's the inverse of a factorial function, then?

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https://www.mathisfunforum.com/profile.php?id=212031 2019-11-07T03:33:35Z https://www.mathisfunforum.com/viewtopic.php?pid=411254#p411254
<![CDATA[Re: factor theoroms]]> Inverses in Mathematics:

Multiply/Divide
Powers/Roots
Integrate/Differentiate

If you can do something in maths, then someone is bound to say "can you go backwards?"

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https://www.mathisfunforum.com/profile.php?id=2 2005-08-26T22:15:25Z https://www.mathisfunforum.com/viewtopic.php?pid=13410#p13410
<![CDATA[Re: factor theoroms]]> Precisly. But the obvious observations are the ones that are most often overlooked. For me at least. lol.

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https://www.mathisfunforum.com/profile.php?id=1041 2005-08-26T16:08:20Z https://www.mathisfunforum.com/viewtopic.php?pid=13398#p13398
<![CDATA[factor theoroms]]> I made a small oberservation which is really obvious but I never quite realized before and it has helped me to simplify quicker once I've solved for the values of some variables.

if xy = 1, then x and y are reciprocals of eachother, so if you know x = 2 you know y = 1/2. Of course solving for x or y does the same thing but its slightly faster to just take the reciprocal.

Likewise, if xy = 5, then x = 5 times the reciprocal of y and y = 5 times the reciprocal of x.  Of course you can just solve for x or y but I find it faster to simply take the reciprocal and multiply times 5.

So obviousy if xy= n then x = n/y and y = n/x      but if I think of it as x = 1/y * n, or y = 1/x*n its slighty faster to do in my head, for me at least.

Likewise, if xyz = 1, then the product of 2 of the variavles equals the reciprocal of the other, and I think if xyz = n, then the product of 2 of the variables will equal n times the reciprocal of the other.

I find its just good to be aware of this, it tends to speed things up.

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https://www.mathisfunforum.com/profile.php?id=1041 2005-08-25T23:43:27Z https://www.mathisfunforum.com/viewtopic.php?pid=13336#p13336