SOLUTION: For f(x)=1/2x, determine: f(1)-f(3)

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Question 992487: For f(x)=1/2x, determine:
f(1)-f(3)
Answer by ikleyn(52794) About Me  (Show Source):
You can put this solution on YOUR website!
.
1%2F2.1 - 1%2F2.3 = %281-3%29%2F2 = %28-2%29%2F2 = -1.

If it is not a joke then what is this?