Indeterminant limit (radical in denominator)

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In summary, an indeterminant limit is a mathematical concept that occurs when the limit of a function cannot be determined by simply substituting values into the function. To solve an indeterminant limit, algebraic techniques such as factoring, simplifying, or rationalizing the expression may be used. A radical in the denominator is a mathematical expression that contains a root symbol, which can lead to an indeterminant limit. Indeterminant limits are used to evaluate the behavior of a function, find the slope of a tangent line, or determine the continuity of a function. They can also occur in real-world scenarios, such as in physics or engineering problems.
  • #1
furiouspoodle
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Homework Statement



[tex]\lim_{x \to {4}}\frac{4 - x^2}{2 - \sqrt{x}}[/tex]

Homework Equations


The Attempt at a Solution



[tex]\lim_{x \to {4}}\frac{4 - x^2}{2 - \sqrt{x}} \cdot \frac{2 + \sqrt{x}}{2 + \sqrt{x}}[/tex]

[tex]= \frac{x(4-x)(2-\sqrt{x})}{(4-x)} = x(2-\sqrt{x}) [/tex]

this equals zero, but is the limit indeterminate at this point?
 
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  • #2
I think you expanded the numerator incorrectly
 
  • #3
thanks! it was a missed minus sign.
 
  • #4
4-x^2 = (2-x)*(2+x)
 

What is an indeterminant limit?

An indeterminant limit is a mathematical concept that occurs when the limit of a function cannot be determined by simply substituting values into the function. This typically happens when the numerator and denominator of a function approach zero or infinity at the same time.

How do you solve an indeterminant limit?

To solve an indeterminant limit, you must use algebraic techniques such as factoring, simplifying, or rationalizing the expression. You may also need to use L'Hôpital's rule or other advanced methods to evaluate the limit.

What is a radical in the denominator?

A radical in the denominator is a mathematical expression that contains a square root, cube root, or other root symbol in the denominator of a fraction. These expressions can sometimes lead to an indeterminant limit.

Why do we use the concept of indeterminant limits?

Indeterminant limits are used to evaluate the behavior of a function as it approaches a certain value. They can also be used to find the slope of a tangent line to a curve or determine the continuity of a function at a specific point.

Can indeterminant limits exist in real-world scenarios?

Yes, indeterminant limits can occur in real-world scenarios, particularly in physics and engineering problems. For example, when calculating the acceleration of a falling object, the velocity and time may both approach zero, resulting in an indeterminant limit.

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