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Math Help - parabola

  1. #1
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    parabola

    Help with any would be very appreciated!

    1. A triangle with the following can't exist, right? Sides of 3cm, 3cm and a non included angle of 90 degrees. BUT, can i change one of the sides so that exactly 2 triangles exist? How..?

    2. Parabola has an axis of symmetry at x=2 and a focus at (2,5). What is a possible eq. for the parabola in standard form?
    Right now I had: vertex at (2,0) And my parabola opens upwards. My directrix would be y=-5 ya? And my eq is (x-2)^2=-20(y-5)....Why is this wrong?

    3. Give a general form eq. of an ellipse and a hyperbola. Explain how u know that the eq's yield the intended results. (THEN, convert into standard form).

    HELP!!!!! PLEASE AND THX!!
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by saramay View Post
    Help with any would be very appreciated!

    1. A triangle with the following can't exist, right? Sides of 3cm, 3cm and a non included angle of 90 degrees.
    correct

    BUT, can i change one of the sides so that exactly 2 triangles exist? How..?
    i do not understand your question.

    2. Parabola has an axis of symmetry at x=2 and a focus at (2,5). What is a possible eq. for the parabola in standard form?
    Right now I had: vertex at (2,0) And my parabola opens upwards. My directrix would be y=-5 ya? And my eq is (x-2)^2=-20(y-5)....Why is this wrong?

    3. Give a general form eq. of an ellipse and a hyperbola. Explain how u know that the eq's yield the intended results. (THEN, convert into standard form).

    HELP!!!!! PLEASE AND THX!!
    This should help. See post #2

    For the last question, what intended results?
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