How to Find the Limit of a Power Function Using Desmos?

In summary, the conversation discusses the process of finding the limit using Desmos and the use of the standard limit formula. The conversation also explains the disappearance and reappearance of the graph and the importance of considering large values of x and small values of y.
  • #1
karush
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  • #2
karush said:
Ok all I did was DesmosNot real sure how to take limit

Why are you plugging in large negative values for x? Surely for an infinite limit you should be plugging in large positive values.

As for a hint, you should use the standard limit $\displaystyle \lim_{x \to \infty} \left( 1 + \frac{1}{x} \right) ^x = \mathbf{e} $.
 
  • #3
Ok I see what you mean
But there is no graph on the positive side

also its 2 not 1
 
Last edited:
  • #4
What do you mean "there is no graph on the positive side"? Of couse there is.
 
  • #5
karush said:
Ok I see what you mean
But there is no graph on the positive side

also its 2 not 1
Prove It is not giving you the answer he is giving you a suggestion that you can use the limit he posted. See if there is any kind of substitution you can make to put your limit into the form he gave you.

And the graph of f(x) becomes real again for \(\displaystyle x \geq 2\). (Why does it "disappear?" Why does it "reappear?")

-Dan
 
  • #6
actually I don't know why it does not graph $0\le x \le 2$
 
  • #7
karush said:
actually I don't know why it does not graph $0\le x \le 2$

Look at the numbers. Can you divide by 0? Can you take an even root of a negative number?
 
  • #8
For this problem it doesn't matter that "it does't graph" between 0 and 2!

Using the "Desmos graphing calculator" at [FONT=Verdana,Arial,Tahoma,Calibri,Geneva,sans-serif]https://www.desmos.com/calculator you can look at the graph at very large x and small values of y so get an idea of the values you need.[/FONT]
 

FAQ: How to Find the Limit of a Power Function Using Desmos?

What is the definition of the limit of a power function?

The limit of a power function is the value that a function approaches as its input approaches a specific value, also known as the limit point. It is denoted by the notation lim x→a f(x) and can be calculated by evaluating the function at values increasingly closer to the limit point.

How is the limit of a power function different from the limit of a polynomial function?

A power function is a type of polynomial function, but it has a specific form of ax^n, where n is a real number. The limit of a power function can be calculated using the same methods as a polynomial function, but it may have a different limit value depending on the value of n.

Can the limit of a power function be calculated at infinity?

Yes, the limit of a power function can be calculated at infinity. This is known as the horizontal asymptote of the function and can be found by evaluating the limit as x approaches infinity or negative infinity.

How does the degree of a power function affect its limit?

The degree of a power function, represented by n, determines the behavior of the function near its limit point. If n is even, the function will have a similar behavior on both sides of the limit point. If n is odd, the function will have different behaviors on each side of the limit point, with one side approaching positive infinity and the other approaching negative infinity.

Are there any special cases when calculating the limit of a power function?

Yes, there are a few special cases when calculating the limit of a power function. If the limit point is the base of the power function, the limit will be equal to the exponent. Additionally, if the limit point is a negative number and the exponent is even, the limit will be undefined. Finally, if the limit point is a negative number and the exponent is odd, the limit will be equal to negative infinity.

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