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f(-5)=25-10-3
=12
f(3)=9+6-3
=12
b.f(x)=2x2+x-4
f(-5)=50-5-4
=41
f(3)=18+3-4
=17
c.f(x)=x2+3x
f(-5)=25-15
=10
f(3)=9+9
=18
d.f(x)=x2-9
f(-5)=25-9
=16
f(3)=9-9
=0