f(x)=3x+5
f(-2)=3×(-2)+5
= -6+5
=-1
f(-1)=3×(-1)+5
=-3+5
=2
f(0)=3×0+5
=0+5
=5
f(1)=3×1+5
=3+5
=8
f(2)=3×2+5
=6+5
=11
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