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f(1)=1^2-2.1
=1-2
=-1
f(2)= 2^2-2.2
=4-4
=0
f(3)= 3^2-2.3
=9-6
=3
f(4)= 4^2-2.4
=16-8
=8
jadi, Range f adalah {-1,0,3,8}
kayaknya gt. smg membantu