SOLUTION: Write the equation of a parabola with vertex (1,-9) and directrix y=-9-7

 

Hi,

parabola with vertex (1,-9) and directrix y = -9-7

Note: The standard form is , where  the focus is (h,k + p) and Directrix is y = (k-p)

 p = 7, 4p = 28 ,  standard form is ,  Vertex form: y = 1/28(x-1)^2 - 9 

the vertex form of a Parabola opening up(a>0) or down(a<0),  

where(h,k) is the vertex  and  x = h  is the Line of Symmetry