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math

 May 11, 2019
 #1
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Focus  =  (-8, -3)

Directrix  x = - 2

 

This parabola opens to the left because the focus is to the left of the directrix

For this reason....we can throw out answers B and D.....these parabolas open up/down

 

The  vertex is  [ (-8 - 2)/2, -3)  =  ( -10/2, -3)  =  (-5, -3)

 

We can stop here

 

"C"   has  a vertex of (-5, -3)   and the presence of the " - "  in front of the "12" indicates that this one opens to the left

 

cool cool cool

 May 11, 2019

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