a

b

a = -1
b = 4
f_1(x) = -(x) + 1.0
f1 = If(x ≤ a, f_1)
f_2(x) = 3.0
f_3(x) = 1.0 / 2.0 * x - 1.0
f3 = If(x ≥ b, f_3)
c: x = a
d: x = b
f2 = If(x > a ∧ x < b, f_2)
A: (a, f_2(a))
B: (b, f_2(b))