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f(2)= (2)^2-4=0
f(3)= (3)^2-4=5
b) f(-1)= 2(-1)-1/3=-1
f(2)= 2(2)-1/3=1
f(3)= 2(3)-1/3=5/3
c) f(-1)= 3(-1)-6=-9
f(2)= 3(2)-6=0
f(3)= 3(3)-6=3
d) f(-1)= (-1+2)^2=1+4=5
f(2)= (2+2)^2=4+4=8
f(3)= (3+2)^2=9+4=13
^2 significa al cuadrado ejemplo; 2^2= 2.2=4