Lim x-->0-: 2/x Does Not Exist

  • Thread starter Miike012
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In summary, the limit of 1/x - 1/abs(x) as x approaches 0- is not defined because the one-sided limit from the left does not exist. This is because as x approaches 0 from the left, the expression 2/x approaches negative infinity which is not a number. The problem specifically asks for the limit from the left, not from the right.
  • #1
Miike012
1,009
0
Lim 1/x - 1/abs(x)
x -->0-

= 2/x

as x approaches 0- , 2/x approaches neg infinity...

why isn't this correct? the answer is does not exist.
 
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  • #2
What is the limit from the right?
 
  • #3
That is right. "Infinity" is not a number. Saying that a limit is "infinity" or "negative infinity" is just saying that the limit does not exist for a particular reason.

verty, the limit from the right is not relevant. The problem specifically asks for the limit from the left: [itex]\lim_{x\to 0^-}[/itex].
 
  • #4
I apologise, I thought Mike was asking, why isn't this the limit, but he meant, why isn't this the one-sided limit.
 

FAQ: Lim x-->0-: 2/x Does Not Exist

What does "Lim x-->0-: 2/x Does Not Exist" mean?

This notation represents the limit of 2/x as x approaches 0 from the left side. It means that as x gets closer and closer to 0 from the negative direction, the function 2/x does not have a defined limit.

Why does 2/x not have a limit as x approaches 0 from the left?

As x approaches 0 from the left, the value of 2/x becomes infinitely large. This means that the function does not approach a specific value and therefore does not have a defined limit.

Is it possible for a function to have a limit on one side of a point but not the other?

Yes, it is possible for a function to have a limit on one side of a point but not the other. This is known as a one-sided limit and indicates that the function behaves differently depending on which side of the point it is approaching from.

What is the difference between a limit and a value of a function?

A limit is the value that a function approaches as the input approaches a specific point. It may or may not be the same as the actual value of the function at that point. The value of a function is the output when a specific input is given.

Can a function still exist if it does not have a limit at a certain point?

Yes, a function can still exist even if it does not have a limit at a certain point. However, the function may have a discontinuity at that point, meaning it is not continuous and may have a jump or hole in its graph.

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