FE Exam Review - Analytic Geometry - Parabola

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[scorpionyrsd]

The standard from of the parabola is (x - h) ^2 = 4 p ( y - k) and p is the distance from the vertex to the directrix or form the vertex to the focus. It means that if the distance from the vertex to the directrix is 3 units, then you substitute 3 in the equation 4 p ( 4X3)= 12. Also, having the vertex point ( 4, 8), the right answer is B. Thanks

[sekhar]

Thanks for the Clear explanation of concepts!

[cobygualano]

How does the negative for the directrix cancel out?

[tonynwaiwu]

What happened to the negative sign attached to the formula for the directrix x=-p/2?