Limit to infinity

Calculus Level 1

Evaluate

lim x 1 x \displaystyle \lim_{x \to \infty} \frac {1}{x}

Undefined 1 0 \infty

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4 solutions

Finn Hulse
Jun 7, 2014

The graph of y = 1 x y = \frac{1}{x} has a horizontal asymptote of y = 0 y = 0 meaning that as x x increases, the value of y y tends to 0.

Another solution would be to say that constant = 0. \dfrac{\text{constant}}{\infty} = 0.

I think at x tends to zero lim of 1/x is doesn't exists .then all doesn't meet the answer I.e doesn't exist. Please correct it .

shatabdi mandal - 4 years, 9 months ago

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shatabdi mandal - 4 years, 9 months ago

As we substitute values for x we move closer to zero. 1/2, 1/3, 1/4 etc.

As x approaches infinity, 1/x approaches zero.

Therefore the limit of this is zero.

Brian McNamara - 4 years, 8 months ago

I have a doubt here As its suggested constant/∞ = 0 so 1/∞ = 0.................(i) And so is 2/∞ = 0....(ii) From equation one and two 1/∞ = 2/∞ which therefore concludes 1 = 2 which is not possible can somebody explain why is it still right to say this 0 ?

Aryan Tripathi - 1 year, 7 months ago

Because infinity is not a number, and that's why we can't cancel or compare two infinities.

Rajat Pathak - 5 months, 2 weeks ago

set = 99999 \infty=99999

lim x 1 x = 1 99999 = 0.00001 0 \large \displaystyle \lim_{x \to \infty} \frac{1}{x}=\frac{1}{99999}=0.00001\approx 0

easy to understand and very helpful for beginners like me -TheGr6inthehouse

Ewan Sichello - 1 year, 4 months ago

Limit means approach.When the numerator is a constant and the denominator get bigger then by the rules of fractions it get smaller.

So lim x 1 x = 0 \displaystyle \lim_{x \to \infty} \frac{1}{x}=\boxed{\large{0}}

Avner Lim
Mar 8, 2021

1 9 0.1111 , 1 99 0.0101 , 1 999 0.001 , \frac {1}{9} ≈ 0.1111, \frac {1}{99} ≈ 0.0101, \frac {1}{999} ≈ 0.001, and so on. As the denominator approaches \infty , 1 x \frac{1}{x} gets closer to 0 \boxed{0} .

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