Question

F(f(x)) = k²x, f'(x) = ?​

Answer 1

Answer: f(f(x)) = k²x = k(kx) = f(kx),

Explanation:

It follows that f'(x) = k.so f(x) = kx.

Answer 2

f(f(x)) = k²x = k(kx) = f(kx), so f(x) = kx.

It follows that f'(x) = k.