We can do this by substituting the coordinates of the points into the equation of the ellipse.
For the point (-3,2), we substitute x = -3 and y = 2 into the equation:
\[4(-3)^{2}+3(2)^{2}=48\]
\[36+12=48\]
\[48=48\]
For the point $(\sqrt{12}, 0)$, we substitute
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