Hello,
As we know:
Ln A.B = Ln A + Ln B
As you can see in the picture attached, my teacher applied this rule as sigma is out of the root.
I do not understand why the sign before Ln sigma is minus and not plus (I highlighted in yellow)
Is there anyone who could help me on understand why?
As we know:
Ln A.B = Ln A + Ln B
As you can see in the picture attached, my teacher applied this rule as sigma is out of the root.
I do not understand why the sign before Ln sigma is minus and not plus (I highlighted in yellow)
Is there anyone who could help me on understand why?