What is the equation of the line normal to # f(x)=(x-1)(x+2) # at # x=0#?
1 Answer
Jan 14, 2018
Explanation:
Firstly, just expand the brackets so:
Differentiate:
Find
So we now the gradient of the line is is
We need a point on the line and we know it should pass through the point:
So
Substitute into the equation of a line: