Equation of the curve  ….(i)

  Slope of the tangent at 

= 

 Slope of the normal to the curve at 

= ……….(ii)

But Slope of the normal (given) = 

  = 

 From eq. (i), at 

at 

Therefore, the points of contact are (2, 18) and 

 Equation of the normal at (2, 18) is 

And Equation of the normal at  is