The sum of distances from point m to point a (4,0) and B (- 4,0) is about 12. The trajectory equation of point m is obtained

It is an elliptic equation with (4.0), (- 4.0) as the focus. A is 1 / 2 of the sum of the distances from the two focus points to the circle = 6, C = distance from the focus point to the origin = 4. The elliptic equation x ^ 2 / A ^ 2 + y ^ 2 / b ^ 2 = 1. B ^ 2 = a ^ 2-C ^ 2 is substituted into x ^ 2 / 36 + y ^ 2 / 20 = 1. I'm slow in typing, give points!

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