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Babynini
 one year ago
Ellipses
Babynini
 one year ago
Ellipses

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Babynini
 one year ago
Best ResponseYou've already chosen the best response.1oh I know where I calculated wrong. in that c/a and forgot that a was =4 and not 2

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1nope that's not right either.

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1@rvc do you know how to do these?

rvc
 one year ago
Best ResponseYou've already chosen the best response.0bad at circle and conics sorry :(

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1Thanks for looking at it though. Ah well.

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1first off we find a from the major axis a= 4 then we find c by looking at the eccentricity c/a = sq7/2

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0focii on y axis means that the major axis is on Y aix and you are given with the length of major axis and ecc.. you can find minor axis from that data

alekos
 one year ago
Best ResponseYou've already chosen the best response.0It would have a vertical major axis so (xh)^2/b^2 + (yk)^2/a^2 =1 where 2b=8

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1how do I find the minor axis in there?

alekos
 one year ago
Best ResponseYou've already chosen the best response.0eccentricity = sqrt(a^2b^2)/a

alekos
 one year ago
Best ResponseYou've already chosen the best response.0so from this you can find the minor axis

alekos
 one year ago
Best ResponseYou've already chosen the best response.0focii are on the yaxis so h=0

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1so x^2/8 + y^2/16 = 1

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1@iambatman save me. lol

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1I just need to find an equation :P

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1major axis = 2a so a = 4

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Yes good :P \[e = \frac{ c }{ a } ~~~\text{and}~~~ c^2 = a^2b^2\] yes yes this looks good, it will work out nicely

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Ok so notice we're given the eccentricity (e) and it tells us the Foci is on the y  axis, this is important because the foci are ALWAYS on the major axis. So will the major axis run vertically or horizontally?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0That sounds good, so what should we do next

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0You should already realize an error in your work with that information

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1a should be the bigger one?

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1so what numbers do i flip around?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Well lets find b first

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0To do that we have \[e = \frac{ c }{ a }\] and \[c^2 = a^2  b^2\]

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1e = sq7/2 but we're given that a = 4 so do we double that whole thing?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0What was that cute game we were playing earlier? I had a name for it

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1but we're given the e!

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0So what's stopping you from solving for c :)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0So what will be our c value?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Looks good, now what's our next step :)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Right, and how will we do that

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1so that's just c, not c^2

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Yes good observation!

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Stop right there for a second!

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Lets look at the equation you said, what is that for :)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0That's where a lot of people make mistakes, for an ellipse it's \[c^2 = a^2  b^2\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Note the negative sign

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1o.o gasp. that is no bueno.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0:), now remember as I always say it's a game of substitution

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1\[b^2 = 16  (2\sqrt{7})^2\]

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1\[b^2 = 1628\] \[b^2=12\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0No, the negative is there, something is wrong

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Err, \[e = \frac{ c }{ a } \implies c = e \times a \implies c = \frac{ \sqrt{7} }{ 4 } \times 4 \implies \sqrt{7}\] bleh :)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I guess I should be doing the math as well haha

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1ai ai ai I need to go to bed soon. waay to early on a school night =.= and you do too.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0No it's alright we just had mistaken the eccentricity we had sqrt(7)/2 when it's 4 :P

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Don't worry about me :), I'm the dark knight, night is where I work muahah!

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1right, right, how could I forget!

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Alright so lets find b again bleh :)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0\[a = 4~~~c = \sqrt{7}\]

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1so..the answer I had at the very beginning. Look at the screenshot thing =.=

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0major axis runs vertically :P

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1ooh myy goooshh aspidghpaihgpi

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1fricken hour later hahahah

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0It's ok, the struggle is more important than the final answer, you will remember how to do it now :)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Not me, you are a genius! You deserve a fields medal hehe!

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1noo no bro the answers wrong still D:

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1...can you write out the whole answer just so i make sure to put it right?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0and y runs vertically hence \[\frac{ x^2 }{ 9 }+ \frac{ y^2 }{ 16 } = 1\]

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1That little green mark though :')

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Yes, sorry about that I did not check if you put a^2

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1it's all good :) so it was indeed my first answer just forgot to ^2 the a

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Yes, we just had to switch it around, but in a test you would have to show your work, and you now know how to do that! :) It's a game of substitution as always!

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1haha cuz we hate the players (not really) but love the game ;)

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1*hug hug hug. you are a trooper. haha and with that. I am off to bed.
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