# What is the equation of the normal line of #f(x)=x^3-x^2+8x-9# at #x=-1#?

##### 1 Answer

Sep 1, 2016

#### Explanation:

rArr f(-1)=-1-1-8-9=-19#.

Therefore, we require the eqn. of normal to the curve

We have,

But, we know that,

Normal is

Hence, eqn. of normal is

Enjoy Maths.!