Answer:
c
Step-by-step explanation:
f( - 1) with x < 1 , then
f(- 1) = [tex]\sqrt{-(-1)}[/tex] = [tex]\sqrt{1}[/tex] = 1
f(1) with x ≥ 1 , then
f(1) = x + 1 = 1 + 1 = 2
Thus
f(- 1) + f(1) = 1 + 2 = 3 → c
