Answer
a) 12
b) 6
Work Step by Step
a) $f(-1)=1-3(-2)^2=1-12=-11$
$f(0)=1-3(0)^2=1-0=1$
$f(0)-f(-2)=1--11=12$
b) $\frac{1--11}{0--2}=6$
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