Question

Let f: R → R be defined by f(x) = {k - 2x, if x ≤ -1, f(x) = {2x + 3, if x > -1. If f has a local minimum at x = -1, then a possible value of l is

(1) 0

(2) -(1/2)

(3) -1

(4) 1

Answer 1

3

f(x) = k – 2x if x –1

= 2x + 3 if x > –1