Answer
$(-2,0), (2,0), (0,-3) $
y-axis Symmetry
Work Step by Step
Let's first observe that $f(x)=f(-x)$ and thus there is y-axis symmetry.
We then substitute $0=x$ to get $y=-3$
and $y=0$ to get $3x^2=12$ or $x=2,-2$
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