Limit Problem: Solving Lim as x goes to infinity of sqrt(x^2 + 1) / x

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In summary, when evaluating the limit of sqrt(x^2 + 1) / x as x goes to infinity, you can divide by the highest power of x. To do this, you can rewrite x^2 + 1 as x^2(1 + 1/x^2) and then use the property of limits to simplify the expression. This results in a final limit of 1, indicating that the limit of the original expression goes to 1 as x goes to infinity.
  • #1
icosane
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Homework Statement



Lim as x goes to infinity of sqrt(x^2 + 1) / x


The Attempt at a Solution



know you are supposed to divide by the highest power of x, but how does that work when you have an x^2 within a sqrt?
 
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  • #2
Try writing x2+1 as x2(1+1/x2).

See if that helps.
 
  • #3
And remember that [itex](1/x)\sqrt{x^2+ 1}= \sqrt{(1/x^2)(x^2+ 1}[/itex]
 
  • #4
put your x into the square root by making it X^2...then it will be easy because you will get something like
limit x--->infinity sqrt(1+1/X^2)
and when x goes to infinity 1/X^2 goes to zero
so your final limit will go to 1
hope you got it!
 
  • #5
You've got three responses saying the same thing in different ways!
 

1. What is a limit problem?

A limit problem is a type of mathematical problem that involves finding the value that a function approaches as its input (x) gets closer and closer to a specific number or infinity.

2. How do you solve a limit problem?

The most common method for solving a limit problem is to use algebraic techniques such as factoring, simplifying, and combining like terms. Another approach is to use the properties of limits, such as the limit laws, to manipulate the expression and find the limit value.

3. What does "lim as x goes to infinity" mean?

This notation indicates that we are trying to find the limit of a function as the input (x) approaches infinity. In other words, we are looking at the behavior of the function as the value of x gets larger and larger without bound.

4. What is the limit as x goes to infinity of sqrt(x^2 + 1) / x?

The limit as x goes to infinity of sqrt(x^2 + 1) / x is equal to 1. This can be determined by factoring out an x from the numerator and denominator, which simplifies the expression to sqrt(1 + 1/x^2). As x approaches infinity, 1/x^2 becomes smaller and smaller and approaches 0, making the entire expression equal to 1.

5. Why is it important to solve limit problems?

Solving limit problems is important because it allows us to understand the behavior of a function as its input approaches a specific value. This can help us make predictions about the behavior of the function, evaluate the continuity of a function, and find the derivatives of functions, which are essential in many mathematical and scientific applications.

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