Sumali sa IDNStudy.com at simulang makuha ang maaasahang mga sagot. Ang aming komunidad ay handang magbigay ng malalim at maaasahang mga sagot, anuman ang kahirapan ng iyong mga katanungan.

Axis horizontal, vertex (1, 2), latus rectum 6
Find the Equation of the parabola


Sagot :

The equation of a parabola with vertex (h,k) with horizontal axis is 

(y-k)² = 4p (x-h) , where |p| is the distance of the focus (or directrix) from the vertex.

1/2 Latus rectum = Distance from the directrix to the focus. (verify using the definition of parabola)

Since the vertex lies in the middle of the directrix and focus, |p| = 3.

Therefore the equation of the parabola is 

(y-2)² = 4(±3) (x-1)
(y-2)² = ±12 (x-1)

Note: The sign indicates where the parabola opens. In this case, if it's +, then it opens to the right. Otherwise, it opens to the left.