http://i56.tinypic.com/2rzxhg9.jpg

I'm trying to understand what's happening here, and particurlarly why the signs change. I think: "take all sides to the power ^-1". But then the signs shouldn't change... i'm so perplexed ;)

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- Mar 12th 2011, 12:01 PMiBurgerSolving an interval for s^2
http://i56.tinypic.com/2rzxhg9.jpg

I'm trying to understand what's happening here, and particurlarly why the signs change. I think: "take all sides to the power ^-1". But then the signs shouldn't change... i'm so perplexed ;) - Mar 12th 2011, 12:06 PMskeeter
let's look at something a bit simpler ...

note that

now, what is the relationship between their reciprocals? - Mar 12th 2011, 12:13 PMiBurger
- Mar 12th 2011, 01:00 PMiBurger
I'm pretty sure that's it. Thank you!