Understanding Derivatives to Solving y = x^(x^2-7)

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In summary, a derivative is a mathematical concept that measures the rate of change of one variable with respect to another. It is important because it allows us to analyze and understand the behavior of functions and their rates of change, and is used in real-world applications. To find the derivative of a simple function, one can use the power rule, product rule, quotient rule, or chain rule. A common mistake when taking derivatives is forgetting to use the chain rule and paying attention to signs and exponents. Derivatives can also be used to find the maximum or minimum of a function by analyzing critical points.
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Chadlee88
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Could som1 please explain how to derive y = x^(x^2-7)

I started using the chain rule but got stuck wif the x base.


thanx in advance
 
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Do you mean "find the derivative"? (Yes, "derive f(x)" can mean that but often it means "derive this formula".)

Use "logarithmic differentiation". (In fact, I would expect a problem like this to be in a section of the book titled "logarithmic differentiation"!)

If [itex]y= x^{x^2- 7}[/itex] then [itex]ln(y)= (x^2- 7)ln(x)[/itex].
Can you differentiate both sides of that? Then solve for dy/dx.
 

FAQ: Understanding Derivatives to Solving y = x^(x^2-7)

What is a derivative?

A derivative is a mathematical concept that measures the rate of change of one variable with respect to another. In simpler terms, it is the slope of a curve at a specific point.

Why is taking derivatives important?

Taking derivatives is important because it allows us to analyze and understand the behavior of functions and their rates of change. It is also used in many real-world applications, such as in physics and economics.

How do I find the derivative of a simple function?

To find the derivative of a simple function, you can use the power rule, product rule, quotient rule, or chain rule, depending on the form of the function. It is important to remember to follow the proper order of operations and use the correct rules.

What is a common mistake when taking derivatives?

A common mistake when taking derivatives is forgetting to use the chain rule when dealing with composite functions. It is also important to pay attention to the signs and exponents in each step of the process.

Can I use derivatives to find the maximum or minimum of a function?

Yes, derivatives can be used to find the maximum or minimum of a function. The maximum or minimum occurs at the point where the derivative is equal to zero or does not exist. This is known as a critical point, and further analysis can be done to determine if it is a maximum or minimum.

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