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anonymous

  • one year ago

Directrix: Y=9 Focal Point: (7,6) Create an equation for a parabola.

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  1. anonymous
    • one year ago
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    @Hero

  2. anonymous
    • one year ago
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    The work should look like this

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  3. anonymous
    • one year ago
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    I can upload another example if needed

  4. Hero
    • one year ago
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    Seems easy enough. What prevents you from being able to do it yourself?

  5. anonymous
    • one year ago
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    I am not good at foiling, or solving for a variable

  6. Hero
    • one year ago
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    Show the steps up to the point where you get stuck. Then I'll help.

  7. anonymous
    • one year ago
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    In the picture, where it says y2^2+6y2+9 in red, I dont know how they are getting the numbers. If I knew where the numbers came from, I could solve it.

  8. Hero
    • one year ago
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    It comes from squaring \((y_2 + 3)^2\).

  9. anonymous
    • one year ago
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    ok, but where does the 6y2 and the 9 come in

  10. anonymous
    • one year ago
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    oh i see, i think i got it now!!!!

  11. Hero
    • one year ago
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    \(\begin{align*}(y_2 + 3)^2 &= (y_2 + 3)(y_2 + 3)\\&=y_2(y_2 + 3) + 3(y_2 + 3) \\&= y_2^2 + 3y_2 + 3y_2 + 9 \\&=y_2^2 + 6y_2 + 9\end{align*}\)

  12. anonymous
    • one year ago
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    ok, thank you so much! I believe I got it know!

  13. Hero
    • one year ago
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    Okay, good.

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spraguer (Moderator)
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is replying to Can someone tell me what button the professor is hitting...

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