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

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SUMMARY

The discussion focuses on deriving the function y = x^(x^2 - 7) using logarithmic differentiation. Participants clarify that the chain rule is insufficient for this problem due to the variable base. The correct approach involves taking the natural logarithm of both sides, resulting in ln(y) = (x^2 - 7)ln(x). This method allows for differentiation of both sides to solve for dy/dx effectively.

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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.
 

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