We can substitute these points into the equation to get three equations in terms of $a$, $b$, and $c$.
Substituting $(-1,-2)$ into the equation, we get:
\[ -2 = a(-1)^2 + b(-1) + c = a - b + c \tag{1} \]
Substituting $(1,-4)$ into the equation, we get:
\[ -4 =
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