Answer:
f(3) + f(-3) = 10
Step-by-step explanation:
f(3) = 5 - 2(3)
f(-3) = 5 - 2(-3)
f(3) + f(-3) = 5 - 2(3) + 5 - 2(-3)
f(3) + f(-3) = 5 - 6 + 5 +6
f(3) + f(-3) = -1 + 11
