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High school math elective 2- 1 very anxious ~ ~ ~
According to the meaning of the question, the focus is on the Y axis, which is (0, root 3)

Let the equation be x 2/b 2+y 2/(b 2+3) = 1 and substitute (-1, -2).

Find b 2 = 3.

That is, the equation is x 2/3+y 2/6 =1.