Answer
$f(x)=-3x^2+1$
Work Step by Step
Integrate $f'(x)$:
$\int f'(x) dx=\int (-6x)dx=-3x^2+C$
$f(x)=-3x^2+C$
Set in $f(1)=-2$ and solve for $C$:
$-2=-3(1)^2+C$
$C=-2+3=1$
$f(x)=-3x^2+1$
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