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f(x) = 2x --> f(3) = 2(3) = 6
f(-x) = -f(x) --> f(-3) = 2(-3) = -6
--> -f(x) = -2(3) = -6
Apabila fungsi f(x) = 2x, nilai f(-x) = -f(x).
b. Anggap x = 3.
f(x) = x² --> f(3) = 3² = 9
f(-x) = -f(x) --> f(-3) = (-3)² =9
--> -f(x) = -1(3)² = -9
Apabila fungsi f(x) = x², nilai f(-x) tidak sama dengan -f(x).