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Babynini

  • one year ago

Check please!

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  1. Babynini
    • one year ago
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  2. Babynini
    • one year ago
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    @ganeshie8

  3. Babynini
    • one year ago
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    is that correct? I feel like I did something wrong xD

  4. ganeshie8
    • one year ago
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    doesn't look correct

  5. Babynini
    • one year ago
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    Yeah I figured.

  6. ganeshie8
    • one year ago
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    scroll down http://www.wolframalpha.com/input/?i=focus+20x%5E2%2B4y%5E2%3D5

  7. Babynini
    • one year ago
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    hrrm but I want to know the process of how to get there ( so i learn it better) :P

  8. Babynini
    • one year ago
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    (x^2/20)+(y^2/4)=5

  9. Babynini
    • one year ago
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    a^2=20 a=2sq5

  10. Babynini
    • one year ago
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    b^2=4 b=2

  11. ganeshie8
    • one year ago
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    \[20x^2+4y^2 = 5\] start by dividing both sides by \(5\)

  12. Babynini
    • one year ago
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    oooh oh I forgot to get one on the right side

  13. Babynini
    • one year ago
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    \[\frac{ 20x^2 }{ 5 }+\frac{ 4y^2 }{ 5 }=0\]

  14. ganeshie8
    • one year ago
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    \[20x^2+4y^2 = 5\] dividing both sides by \(5\) gives \[\frac{20x^2}{5}+\frac{4y^2}{5} = \frac{5}{5}\] which is same as \[\frac{x^2}{1/4} + \frac{y^2}{5/4}=1\]

  15. Babynini
    • one year ago
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    right

  16. ganeshie8
    • one year ago
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    \(\frac{5}{5}\) equals \(1\) not \(0\)

  17. Babynini
    • one year ago
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    aii yeah.

  18. ganeshie8
    • one year ago
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    \[\frac{x^2}{1/4} + \frac{y^2}{5/4}=1\] \(a^2 = 5/4\) \(b^2 = 1/4\)

  19. Babynini
    • one year ago
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    Wouldn't it be 4/5? not 5/4?

  20. anonymous
    • one year ago
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    No remember an ellipse as following \[\frac{ x^2 }{ a^2 } + \frac{ y^2 }{ b^2 }=1\]

  21. Babynini
    • one year ago
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    ...then it'd be a^2 = 1/4 b^2 = 5/4 ? o.o

  22. ganeshie8
    • one year ago
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    which ever is big is \(a\)

  23. Babynini
    • one year ago
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    oou.

  24. anonymous
    • one year ago
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    \[a \ge b > 0 \]

  25. ganeshie8
    • one year ago
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    big : major : \(a\) small : minor : \(b\)

  26. Babynini
    • one year ago
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    Yeah yeah, I gotcha now :)

  27. ganeshie8
    • one year ago
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    5/4 is greater than 1/4 so the thing under \(y\) is \(a\) and consequently the ellipse stretches along \(y\) axis (vertical)

  28. Babynini
    • one year ago
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    yeah

  29. ganeshie8
    • one year ago
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    \(a^2 = 5/4\) \(b^2 = 1/4\) next use the chart for vertical ellipse |dw:1433224590567:dw|

  30. anonymous
    • one year ago
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    It's best if you graph it, then everything becomes obvious say we have \[\frac{ x^2 }{ 9 }+\frac{ y^2 }{ 5 }=1\] |dw:1433224525998:dw| such a bad drawing but notice i square root 9 and 5 \[a^2 = 9 \implies \sqrt{9} = 5~~~~~b^2 = 5 \implies \sqrt{5}\]

  31. anonymous
    • one year ago
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    Just an easy example to show you whats going on

  32. Babynini
    • one year ago
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    hrm yeah. I think this one just messed me up because it's turned the other way.

  33. anonymous
    • one year ago
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    Yeah ganeshie put up a nice chart :P

  34. Babynini
    • one year ago
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    I can't see the chart o.o it looks fuzzy.

  35. anonymous
    • one year ago
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    Try http://puu.sh/i9kBs/ee49513aac.png

  36. Babynini
    • one year ago
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    ah, there it is :)

  37. Babynini
    • one year ago
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    ok so for major and minor axis usually it's 2a for major 2b for minor same here?

  38. anonymous
    • one year ago
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    Yeah that sounds good

  39. Babynini
    • one year ago
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    soo it'd be 2a = 5/4 2b=1/4 ?? because they don't like those answers

  40. anonymous
    • one year ago
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    Remember square :P

  41. anonymous
    • one year ago
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    a^2 = 5/4

  42. Babynini
    • one year ago
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    so 25/16

  43. Babynini
    • one year ago
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    and 1/16

  44. ganeshie8
    • one year ago
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    whats 25/16 ?

  45. Babynini
    • one year ago
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    Major axis.

  46. anonymous
    • one year ago
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    No, \[a = \frac{ \sqrt{5} }{ 2 }\] 2 will just get cancelled

  47. Babynini
    • one year ago
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    -.- what? a = 5/4 a^2 = 25/16

  48. ganeshie8
    • one year ago
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    who said a=5/4

  49. anonymous
    • one year ago
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    \[a^2 = 5/4\]

  50. Babynini
    • one year ago
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    oh yeah.

  51. Babynini
    • one year ago
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    GOSH DARNIT

  52. Babynini
    • one year ago
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    so yeah a = sq5/2

  53. anonymous
    • one year ago
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    Yes

  54. Babynini
    • one year ago
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    so 2a = ?

  55. anonymous
    • one year ago
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    It's a game of substitution, what is a?

  56. Babynini
    • one year ago
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    sq5/2

  57. Babynini
    • one year ago
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    2(sq5/2)

  58. anonymous
    • one year ago
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    Right, so now multiply that by 2

  59. anonymous
    • one year ago
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    Good and we get?

  60. Babynini
    • one year ago
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    (2sq5)/2

  61. Babynini
    • one year ago
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    oh sq 5

  62. anonymous
    • one year ago
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    Yes :) I actually put that up earlier

  63. Babynini
    • one year ago
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    haha thanks for putting up with me xP i'm incorrigible. meeh.

  64. Babynini
    • one year ago
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    and then 2b =

  65. anonymous
    • one year ago
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    It's cool, ganeshie has taught me how to be patient :P

  66. Babynini
    • one year ago
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    Yall are amazing lol I hate it when people i'm trying to help don't get it. So I offer a thousand apologies xD

  67. anonymous
    • one year ago
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    \[b^2 = 1/4\] right? so do same as above

  68. Babynini
    • one year ago
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    = 1?

  69. anonymous
    • one year ago
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    Looks good

  70. Babynini
    • one year ago
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    yay! for the first time in forever, I get an answer right :D

  71. Babynini
    • one year ago
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    thanks so much.

  72. anonymous
    • one year ago
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    Np :) sorry to butt in like that ganeshie, I just love ellipses.

  73. Babynini
    • one year ago
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    ^ xD

  74. Babynini
    • one year ago
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    I have unlimited piles of ellipses on my homework *cough cough

  75. Babynini
    • one year ago
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    though your hate for me might just over ride your love for ellipses

  76. anonymous
    • one year ago
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    I have one emotion, and that's batman.

  77. Babynini
    • one year ago
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    You...are a true sir.

  78. ganeshie8
    • one year ago
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    he is a true super hero

  79. ganeshie8
    • one year ago
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    length major axis : \(\sqrt{5}\) length of minor axis : \(1\) what about others

  80. Babynini
    • one year ago
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    other what now?

  81. anonymous
    • one year ago
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    Focus, vertex etc

  82. Babynini
    • one year ago
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  83. anonymous
    • one year ago
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    Ah nicely done :)

  84. Babynini
    • one year ago
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    thanks to you guys :)

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is replying to Can someone tell me what button the professor is hitting...

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