SOLUTION: identify the focus and directrix of the equation: {{{x=-1/16y^2}}} |a|=1/4c |-1/16|=1/4c |1/16|=1/4c 16=4c 16/4=c c=4 (-4,0) is the focus? and 4 is the directrix?

Question 731589: identify the focus and directrix of the equation:

|a|=1/4c
|-1/16|=1/4c
|1/16|=1/4c
16=4c
16/4=c
c=4
(-4,0) is the focus? and 4 is the directrix?

Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!

it's correct, (-4,0) is the focus and 4 is the directrix
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