Question

Let f(x) = 15–|x – 10|; x ∈ R. then the set of all values of x, at which the function, g(x) = f(f(x)) is not differentiable, is:
(A) {5, 10, 15} (B) {10}
(C) {5, 10, 15, 20} (D) {10, 15}

Answer 1

Answer:

sorry I dunno buddy............