OOPS I can't read, it said normal not tangent.
a) The line will be y = -(1/f '(0))*x+f(0), since it has to go through f(0) and have slope perpendicular to f '(0).
b) Set the derivative equal to 0, solve for x, plug into f(x) to get the corresponding y values
added spaces because those primes are sorta hard to see
--
No I'm not a damn furry. Looney Tunes are different. - Guiga
I wanted Sonic/Shadow romance at that time, not sex. - MWE