Write the slope of the normal to the curve 
at the point 
Given that 
On differentiating both sides w.r.t. x, we get
Now, slope of the tangent at 
Slope of normal = 9
1
Write the slope of the normal to the curve at the point
Given that
On differentiating both sides w.r.t. x, we get
Now, slope of the tangent at
Slope of normal = 9