1. ## integration

f(x)=10/x
F(x)=???

2. Pull back the constant and remember what the derivative of natural log. is.

3. my book says:

f(x)=1/x ---> F(x)=ln(x)

But I don't see what happens to 1 and 10 in my case

4. As I said, you can just pull out that constant, it's a property. It says $\int k\cdot f(x)\,dx=k\int f(x)\,dx.$

5. Oh, so my answer is just
F(x)=ln(x)+k
???

6. No
If F(x)=ln(x)+k then f(x)=1/x

Answer is simply F(x)=10 lnx + k