KFS Posted October 5, 2018 Share Posted October 5, 2018 Thank you, Link to comment Share on other sites More sharing options...
Prometheus Posted October 5, 2018 Share Posted October 5, 2018 Do you know why x^2 + 1 doesn't intersect the x axis? Link to comment Share on other sites More sharing options...
mathematic Posted October 5, 2018 Share Posted October 5, 2018 (edited) The expression has a positive constant while the terms dependent on x are functions of \(x^2\), so they are non-negative, thus the entire expression is always positive as a function of x. Edited October 5, 2018 by mathematic typo + latex 1 Link to comment Share on other sites More sharing options...
KFS Posted October 5, 2018 Author Share Posted October 5, 2018 27 minutes ago, mathematic said: The expression has a positive constant while the terms dependent on x are functions of x2 , so they are non-negative, thus the entire expression is always positive as a function of x. Thank, mathematic. Link to comment Share on other sites More sharing options...
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