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still a bit vague, but here goes ...
since all we know about f(x) is that f(1) = -2, we can only say that
g(0) = f(1)-3 = -2-3 = -5
So, (0,-5) is on the graph of g(x)
Setting x = 1/2,
-f(2x) = -f(1) = 2
So, (1/2,2) is on the graph of -f(2x)