Diffrentiation of natural logs (ln)

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In summary, the question is asking to differentiate (ln(5x))^1/5 with respect to x. The correct answer is y'=(ln5x)^-4/5, which can be found using the chain rule.
  • #1
chanella35
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the question is: differentiate wiith repsect to x:

(ln(5x))^1/5

i differentiated and got :

1/5ln(5x)

y'=1/5x


I don't think this is correct. The answer should be ln5/5.

Can anyone help me?

chanella
 
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  • #2
chanella35 said:
the question is: differentiate wiith repsect to x:

(ln(5x))^1/5

i differentiated and got :

1/5ln(5x)

y'=1/5xI don't think this is correct. The answer should be ln5/5.

Can anyone help me?

chanella
That's not right. The answer shouldn't be ln5/5, because that's a number. The answer should be a function.

Use the chain rule: power to the front, subtract 1, multiply by the derivative of what's inside the bracket.
 
  • #3
logarithmic said:
That's not right. The answer shouldn't be ln5/5, because that's a number. The answer should be a function.

Use the chain rule: power to the front, subtract 1, multiply by the derivative of what's inside the bracket.

So the answer would be;

y'=1/5 (5)(ln5x)^(1/5-1)

y'= (ln5x)^-4/5

is this right??

Thanks for helping :)
 
  • #4
chanella35 said:
So the answer would be;

y'=1/5 (5)(ln5x)^(1/5-1)

y'= (ln5x)^-4/5

is this right??

Thanks for helping :)

Almost. The derivative of ln(f(x)) is f'(x)/f(x), so the derivative of ln(5x) is 5/(5x) = 1/x.

So replacing (5) with (1/x), then simplifying is the correct answer.
 

1. What is the formula for differentiating natural logs (ln)?

The formula for differentiating natural logs (ln) is d/dx(ln(x)) = 1/x. This means that the derivative of ln(x) is equal to 1 divided by x.

2. Is the derivative of ln(x) the same as the derivative of log base e (e)?

Yes, the derivative of ln(x) is the same as the derivative of log base e (e), since ln(x) and log base e (e) are just different notations for the same mathematical function.

3. Can natural logs (ln) be differentiated using the power rule?

No, natural logs (ln) cannot be differentiated using the power rule. The power rule only applies to functions in the form of x^n, while ln(x) is a logarithmic function.

4. What is the derivative of ln(e^x)?

The derivative of ln(e^x) is simply 1, since e^x is the inverse function of ln(x) and their derivatives cancel each other out.

5. How can the chain rule be used to differentiate natural logs (ln)?

The chain rule can be used to differentiate natural logs (ln) by first taking the derivative of the inside function, then multiplying it by the derivative of the outside function. For example, to differentiate ln(3x), the chain rule would be used as d/dx(ln(3x)) = (1/3x) * (3) = 1/x.

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