Question

let f be the function given by
a) Find the domain of f.
b) Find f '(x)
c) Find the slope of the line normal to the graph of f at x = 5

f(x) = square root of (x^4-16x^2)

Answer 1

for b) you should get 2x(x^2 - 8) / sqrt x^2 (x^2-16)

Answer 2

how about part a and c?