limit

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8 Answers

1

Vinay Arya ·2011-02-06 02:03:35

Hi kunl
See if I am right
Let f(x)=a+1/x
f'(x)=-1/x²
xf'(x)=-1/x
lim_{xâ†’âˆž}xf'(x)=0
Is the answer right?

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1

kunl ·2011-02-06 02:16:34

Let f(x)=a+1/x???
u need to find limit rigourously!

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Vinay Arya ·2011-02-06 02:20:34

Is the answer not right?And I am taking f(x) to be that because the function is satisfying the given condition.

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Vinay Arya ·2011-02-06 02:29:27

lim_{xâ†’âˆž}f(x)=lim_{xâ†’âˆž}(a+1/x)=a+1/âˆž=a
That's why I am taking it to be that.

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kunl ·2011-02-06 05:14:26

u can't assume functions that yaar[1]

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Vinay Arya ·2011-02-06 06:08:15

Ok.Then the problem is out of my control.But is the answer right?

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shikha112 ·2011-02-06 08:57:43

multiply x in deno. and num, then apply L'hospital, u will get 0 as answer.

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Vinay Arya ·2011-02-06 18:51:01

Oh!Then why Am I not right?But the upper method is quite good.

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