What is the equation of the line normal to #f(x)=-4x^2 -5x +1 # at #x=-3#?
1 Answer
Feb 20, 2016
Explanation:
Let
This is the gradient of the tangent
At
If the gradient of the normal is
To get the value of
The equation of the normal line is of the form:
So the equation is:
This is shown here:
graph{(-4x^2-5x+1-y)(-x/19-383/19-y)=0 [-80, 80, -40, 40]}