Asked by Cope
(y-7)^2 = 12x
Find the directrix
Find the directrix
Answers
Answered by
awesomeguy123
49/12
Answered by
Steve
no matter. the proposed answer is bogus. The directrix is a line, not just a number.
Recall that the parabola
y^2 = 4px
has directrix at x = -p.
Your parabola is shifted up, but that does not change the directrix. So, the desired line is clearly
x = -3
see the properties at
http://www.wolframalpha.com/input/?i=parabola+%28y-7%29^2+%3D+12x
Recall that the parabola
y^2 = 4px
has directrix at x = -p.
Your parabola is shifted up, but that does not change the directrix. So, the desired line is clearly
x = -3
see the properties at
http://www.wolframalpha.com/input/?i=parabola+%28y-7%29^2+%3D+12x
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