# What is the equation of the normal line of #f(x)=ln(1/x)# at #x=5#?

##### 1 Answer

Nov 20, 2015

#### Explanation:

According to the Chain Rule,

Let's find the derivative. (Remember that

Plug back in to find that:

We want the equation of the normal line at the point

We can find the slope of the tangent line at

Therefore, the slope of the normal line is

We can use point-slope form to write an equation:

Or, in slope-intercept form: