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

##### 1 Answer

Jan 17, 2016

#### Explanation:

The slope

and the generic line equation is:

with

- We have to find
#f'(x)# using the Chain Rule

then in

Alternatively:

It's a parabola with **two cincident real roots**.

The roots are

Then the vertex of the parabola it's