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?

Algebra ->  Quadratic-relations-and-conic-sections -> 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?       Log On


   

Question 731589: identify the focus and directrix of the equation:
x=-1%2F16y%5E2
|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) About Me  (Show Source):
You can put this solution on YOUR website!

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