The distance from point m to fixed point F (0.3) is 2 greater than the distance from point m to straight line y = 1

√（y-3)^2 + x^2 - 2 = |y -1|
y> 1, y = x ^ 2 / 8 + 1 is a parabola
When y ≤ 1, x = 0 is the downward part of 1 on the Y-axis of a ray

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