Find the vertex, focus, and directrix for the following parabolas.

(a)
` ( y - 4 )^(2) = 20 ( x - 8) `
vertex : 
focus : 
directrix:   

(b)
` y^(2) - 16 y = 16 x - 8^(2) ` 

vertex : 
focus : 
directrix"   

(c)
` ( x - 6 )^(2) = 16 ( y - 5 ) ` 

vertex : 
focus : 
directrix"   

(d)
` x^(2) + 40 x = 4 y - 16 ` 

vertex : 
focus : 
directrix"   

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