Wednesday, 28 October 2015

limits - Find limxtoinftyfrac(x1)2x+1




Find limx(x1)2x+1




If I divide whole expression by maximum power i.e. x2 I get,limx(11x)21x+1x2



Numerator tends to 1 ,Denominator tends to 0



So I get the answer as +



But when I plot the graph it tends to



What am I missing here? "Can someone give me the precise steps that I should write in such a case." Thank you very much!



NOTE: I cannot use L'hopital for finding this limit.


Answer




Hint: Write x2(11x)2x(1+1x)


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