Find the derivative an determine the values

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In summary, the conversation discusses finding the derivative of a given function and determining the values for which it is equal to 0. It includes a clarification on which part of a fraction would make the whole thing equal to 0 and a correction on the derivative calculation.
  • #1
courtrigrad
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Suppose [tex] f(x) = \frac{(x-3)^{4}}{x^{2}+2x} [/tex]. Find the derivative an determine the values for which it is equal to 0. So [tex] f'(x) = \frac{x^{2}+2x(4(x-3)^{3}) - (x-3)^{4}(2x+2)}{(x^{2}+2x)^{2}} [/tex]. But now how would I go about finding the values for which the derivative equals 0? [tex] f'(x) = \frac{x^{2}+2x(4(x-3)^{3}) (x-3)^{4}(2x+2)}{(x^{2}+2x)^{2}} = 0 [/tex]. Is it possible to factor?

Thanks
 
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  • #2
For any fraction, let's call it [itex]\frac{A}{B}[/itex], which part will make the whole thing equal to 0? A or B?
 
  • #3
A

will yeah
 
  • #4
plugpoint said:
Suppose [tex] f(x) = \frac{(x-3)^{4}}{x^{2}+2x} [/tex]. Find the derivative an determine the values for which it is equal to 0. So [tex] f'(x) = \frac{(x^{2}+2x)(4(x-3)^{3}) - (x-3)^{4}(2x+2)}{(x^{2}+2x)^{2}} [/tex]. But now how would I go about finding the values for which the derivative equals 0? [tex] f'(x) = \frac{x^{2}+2x(4(x-3)^{3}) (x-3)^{4}(2x+2)}{(x^{2}+2x)^{2}} = 0 [/tex]. Is it possible to factor?

Thanks
You missed a set of parentheses.
 
  • #5
Your derivative isn't correct yet, make sure you check that first!
 
  • #6
The derivative is correct, assuming that the missing parentheses BobG mentions is put in correctly!
 

1. What is a derivative?

A derivative is a mathematical concept that measures the rate of change of a function at a specific point. It essentially tells us how much a function is changing at a particular point.

2. Why do we need to find the derivative?

The derivative is an important tool in calculus and is used to solve a variety of problems in physics, engineering, economics, and other fields. It allows us to analyze the behavior of functions and make predictions based on their rates of change.

3. How do you find the derivative of a function?

To find the derivative of a function, we use the rules of differentiation, which include the power rule, product rule, quotient rule, and chain rule. These rules help us to determine the rate of change of a function at a specific point.

4. What are the values of a derivative?

The values of a derivative can vary depending on the function and the point at which it is evaluated. Generally, the value of a derivative represents the slope of a tangent line to the function at a specific point.

5. How can we use derivatives to solve real-world problems?

Derivatives can be used to solve a wide range of real-world problems, such as finding maximum and minimum values, optimizing functions, and predicting future behavior. They are particularly useful in physics and engineering for analyzing the motion of objects and in economics for understanding supply and demand relationships.

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