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anonymous
 one year ago
Derive the equation of the parabola with a focus at (0, −4) and a directrix of y = 4.
f(x) = −16x2
f(x) = 16x2
f(x) = −one sixteenth x2
f(x) = one sixteenthx2
anonymous
 one year ago
Derive the equation of the parabola with a focus at (0, −4) and a directrix of y = 4. f(x) = −16x2 f(x) = 16x2 f(x) = −one sixteenth x2 f(x) = one sixteenthx2

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@satellite73 @princeharryyy

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Ans: f(x) = (1/16)*(x²) D.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0how did you get that ?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0If the focus is at (0,4) and the directrix is y = 4 then the vertex of the parabola is midway between these two features at (0,0). The parabola is thus a downward opening parabola with the standard equation x² = 4cy where c is the distance from the vertex to the focus. In this question, c = 4.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0is that the formula that you would use for all parabola equations?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@nono266 can you explain this better?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0well it say's it's the standard equation. So i am assuming yes...

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0how do you know which one is 'C'

princeharryyy
 one year ago
Best ResponseYou've already chosen the best response.1still need help!

princeharryyy
 one year ago
Best ResponseYou've already chosen the best response.1??? @scenemunster

princeharryyy
 one year ago
Best ResponseYou've already chosen the best response.1ok! from the start.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0yes how do you do that?

princeharryyy
 one year ago
Best ResponseYou've already chosen the best response.1The parabola can look like

princeharryyy
 one year ago
Best ResponseYou've already chosen the best response.1dw:1438718841051:dw

princeharryyy
 one year ago
Best ResponseYou've already chosen the best response.1can u see that. @scenemunster

princeharryyy
 one year ago
Best ResponseYou've already chosen the best response.1and please if u are interested in learning u must be interactive. or u can just have answers. @scenemunster It's up to you.

princeharryyy
 one year ago
Best ResponseYou've already chosen the best response.1let's take a general form. suppose this figure.

princeharryyy
 one year ago
Best ResponseYou've already chosen the best response.1dw:1438719011601:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0this amkes no sense to me tbh

princeharryyy
 one year ago
Best ResponseYou've already chosen the best response.1now, In this figure Point B is known as the vertex of the parabola, A is known as the focus, and line D is known as Directrix of the parabola.

princeharryyy
 one year ago
Best ResponseYou've already chosen the best response.1where C is at the same distance from origin as is the focus of parabola.

princeharryyy
 one year ago
Best ResponseYou've already chosen the best response.1has, it started making sense @scenemunster

princeharryyy
 one year ago
Best ResponseYou've already chosen the best response.1great, The general equation of east facing parabola, whose vertex is at (0,0) is y^2 = 4ax

princeharryyy
 one year ago
Best ResponseYou've already chosen the best response.1are you getting it.

princeharryyy
 one year ago
Best ResponseYou've already chosen the best response.1where a is the distance from vertex to the focus of the parabola

princeharryyy
 one year ago
Best ResponseYou've already chosen the best response.1as distance being a, and the for every positive x there will be two values of y one negative and the other positive , the parabola is sketched this way. i.e., east facing.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0the east facing parabola

princeharryyy
 one year ago
Best ResponseYou've already chosen the best response.1dw:1438719685600:dw

princeharryyy
 one year ago
Best ResponseYou've already chosen the best response.1TAKING THIS AS CONVENTION, ARE U COMFORTABLE NOW.

princeharryyy
 one year ago
Best ResponseYou've already chosen the best response.1@scenemunster ??? please be quick! I don't have much time.

princeharryyy
 one year ago
Best ResponseYou've already chosen the best response.14 comes in general equation. they made the general equation this way

princeharryyy
 one year ago
Best ResponseYou've already chosen the best response.1a is some constant which changes it's value according to question.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@amistre64 can you help as well. im sorry im naturally blonde and i dont know XD

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so what is the equation like how do i set it up

princeharryyy
 one year ago
Best ResponseYou've already chosen the best response.1for your question.

princeharryyy
 one year ago
Best ResponseYou've already chosen the best response.1let me make the figure.

princeharryyy
 one year ago
Best ResponseYou've already chosen the best response.1dw:1438720085660:dw

princeharryyy
 one year ago
Best ResponseYou've already chosen the best response.1where a =4. y = 16x^2

princeharryyy
 one year ago
Best ResponseYou've already chosen the best response.1focus of parabola (0,4)

princeharryyy
 one year ago
Best ResponseYou've already chosen the best response.1That means the answer is a

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ok. i understand but y would it be a my guess was d

princeharryyy
 one year ago
Best ResponseYou've already chosen the best response.1wait a second, it won't actually be A or D it would be C, reason, general equation, x^2 = 4by => x^2 = 16y, b=4 =>y =x^2/16

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ok. my besty said the same thing

princeharryyy
 one year ago
Best ResponseYou've already chosen the best response.1@scenemunster , n sorry actually I was explaining the east one so by mistake I told u A earlier.

princeharryyy
 one year ago
Best ResponseYou've already chosen the best response.1and, later we changed the direction of parabola to south and hence the equation changed. Sorry 'bout that but the answer is C for 100%

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ok i got it thank you
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