- #1

- 38

- 0

**Solve y'= Ln(12x)**

## Homework Equations

Integral of ln(x)= xlnx-x dx

## The Attempt at a Solution

12x*ln(12x)-12x dx or even xlnx-x*1/12

But Im pretty sure these are wrong.

My calculator gives me xlnx+(ln(12)-1)x wth? Help!

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- Thread starter CaityAnn
- Start date

- #1

- 38

- 0

Integral of ln(x)= xlnx-x dx

12x*ln(12x)-12x dx or even xlnx-x*1/12

But Im pretty sure these are wrong.

My calculator gives me xlnx+(ln(12)-1)x wth? Help!

- #2

- 492

- 1

do you know how to do integration by parts?

in order to solve this problem you need to use it.

in order to solve this problem you need to use it.

- #3

cristo

Staff Emeritus

Science Advisor

- 8,122

- 74

Yup, they are incorrect.Solve y'= Ln(12x)

## Homework Equations

Integral of ln(x)= xlnx-x dx

## The Attempt at a Solution

12x*ln(12x)-12x dx or even xlnx-x*1/12

But Im pretty sure these are wrong.

To do this, you should note

Your calculator is correct. [When you have the answer, check to see if yours is the same as this]My calculator gives me xlnx+(ln(12)-1)x wth?

- #4

Kurdt

Staff Emeritus

Science Advisor

Gold Member

- 4,826

- 6

Try substituting 12x = u and work from there.

EDIT: Damn my slowness. And also cristo's method is better, mine is rather lazy.

EDIT: Damn my slowness. And also cristo's method is better, mine is rather lazy.

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