We have that the graph of the piecewise function is
in the case of the values
a. f(-4)=-4-2=-6
b.f(0)=0^2+1=1
c. f(-3)=-3-2=-5
f(f(-3))=-5-2=-7
d. f(0)=1
f(f(0))=1^2+1=2
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