newton333 Posted February 12, 2013 Share Posted February 12, 2013 anyone can explain me why Link to comment Share on other sites More sharing options...
Prometheus Posted February 12, 2013 Share Posted February 12, 2013 Try factorising the numerator. 1 Link to comment Share on other sites More sharing options...
Crimson Sunbird Posted February 12, 2013 Share Posted February 12, 2013 What do you mean by [latex]\frac{-2}{0}=-\infty[/latex]? Link to comment Share on other sites More sharing options...
mathematic Posted February 12, 2013 Share Posted February 12, 2013 The numerator is negative for x ~ -1. The denominator switches sign at x = -1. For x > -1 (~1), the denomiator is negative. As a result the ratio is positive. Another way, using your analysis is (-1 + ε)^2 - 1 ~ 1 -2ε -1 = -2ε. This gives a + sign to your ratio. 1 Link to comment Share on other sites More sharing options...
newton333 Posted February 13, 2013 Author Share Posted February 13, 2013 thank you Link to comment Share on other sites More sharing options...
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