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anonymous
 one year ago
Find the standard form of the equation of the parabola with a focus at (4, 0) and a directrix at x = 4.
anonymous
 one year ago
Find the standard form of the equation of the parabola with a focus at (4, 0) and a directrix at x = 4.

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misty1212
 one year ago
Best ResponseYou've already chosen the best response.1dw:1440121717847:dw

misty1212
 one year ago
Best ResponseYou've already chosen the best response.1you need the vertex first, also which way it is oriented then it is quite quick do you know the vertex?

misty1212
 one year ago
Best ResponseYou've already chosen the best response.1and how is it oriented? dw:1440121829542:dw

misty1212
 one year ago
Best ResponseYou've already chosen the best response.1dw:1440121936412:dw

misty1212
 one year ago
Best ResponseYou've already chosen the best response.1because it opens to the left, that means the \(y\) term is squared, and it will look like \[y^2=px\]

misty1212
 one year ago
Best ResponseYou've already chosen the best response.1all you need is \(p\) the distance from the vertex to the focus, or from the directrix to the vertex what is that distance?

misty1212
 one year ago
Best ResponseYou've already chosen the best response.1oops i made a typo \[y^2=4px\] is what i meant

misty1212
 one year ago
Best ResponseYou've already chosen the best response.1ok so final answer \[y^2=16x\]

misty1212
 one year ago
Best ResponseYou've already chosen the best response.1minus because it opens to the left

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0oh okay so you just have to look for each part and then put it together THANK YOU SO MUCH!!

misty1212
 one year ago
Best ResponseYou've already chosen the best response.1right want to check the answer?

misty1212
 one year ago
Best ResponseYou've already chosen the best response.1\[\color\magenta\heartsuit\] http://www.wolframalpha.com/input/?i=parabola+y%5E2%3D16x

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0y = negative one divided by sixteenx2

misty1212
 one year ago
Best ResponseYou've already chosen the best response.1the y term is squared, not the x term

misty1212
 one year ago
Best ResponseYou've already chosen the best response.1if \[y^2=16x\] is not an "answer choice" try \[x=\frac{1}{16}y^2\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0could we do another one like this and you help me the same way?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Find the standard form of the equation of the parabola with a focus at (0, 9) and a directrix y = 9.

misty1212
 one year ago
Best ResponseYou've already chosen the best response.1dw:1440122328669:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so it open down? vertex is 0,0

misty1212
 one year ago
Best ResponseYou've already chosen the best response.1yeah opens down so the x term is squared and its coefficient it negative

misty1212
 one year ago
Best ResponseYou've already chosen the best response.1distance is clear right?

misty1212
 one year ago
Best ResponseYou've already chosen the best response.1right so \[x^2=36y\] should do it

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0wait how did 36 come from 9

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ohhh yeah okay haah and wouldn't it be y=1/36x2

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0thank you so much! If I have any more tonight ill tag you in them :)

misty1212
 one year ago
Best ResponseYou've already chosen the best response.1\[\huge\color\magenta\heartsuit\]
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