Find f(-1), f(0) and f(4) for the following function.
f(x) = 2x

Answer:
f(-1) = -2
f(0) = 0
f(4) = 8
Step-by-step explanation:
f(x) = 2x
f(-1) = 2(-1)
=> -2
f(0) = 2(0)
=> 0
f(4) = 2(4)
=> 8