If the distance from point a to the focus on the parabola y ^ 2 = 2px is 3 and the abscissa of the point is 2, what is p equal to

The distance from a to the focus is equal to the distance from the point to the guide line. The guide line is x = - P / 2, so the distance from a to the guide line is 2 + P / 2 = 3 = > P = 2

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