# Natural log fxn = negative integral?

1. Nov 23, 2009

### Jules18

1. The problem statement, all variables and given/known data
True or false?

ln(1/10) = -$$\int$$ dx/x

3. The attempt at a solution

I have no idea where to start on this one.

what is dx/x ??

2. Nov 23, 2009

### jakncoke

right side means that u are supposed to integrate with respect to x

-Integrate[1/x] with respect to x

3. Nov 23, 2009

### Staff: Mentor

This is obviously not true as posted. Are there limits of integration that we're not seeing?
I.e., does the integral look like this?
$$-\int_1^{10} \frac{dx}{x}$$

4. Dec 18, 2009

### Jules18

ok I get it. the limits are missing, it must be a typo, but otherwise this makes sense to me now thanks