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=9+6+4
=19
f(-1)=9-3(-1)-(-1)2
=9+3+2
=14
f(0)=9-3(0)-(0)2
=9-0-0
=9
f(1)=9-3(1)-(1)2
=9-3-2
=4
f(2)=9-3(2)-(2)2
=9-6-4
=-1
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