# What is the equation of the normal line of #f(x)=-4x-1# at #x=2#?

##### 1 Answer

Jan 10, 2016

#### Explanation:

If the excercise does not clearly request the derivation use, you could also think:

is a line, then the tangent line to it is the line itself

with

and

The normal line is

with

then:

the normal line becomes: