58 Part I: The Questions
Finding Equations of Normal
Lines
405–407 Find the equation of the normal line at the
indicated point.
405. f
 
(x) = 3x
2
+ x – 2 at (3, 28)
406. f
 
(x) = sin
2 
x at x = π
4
407. f
 
(x) = 4 ln x + 2 at x = e
2